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How To Become A Data Aanalyst In 2021?

In 2020, Data Analysis has become one of the core functions in any organization. This is a highly sought-after role that has evolved immensely in the past few years. But what is Data Analysis?  What do Data Analysts do? How to become a Data Analyst in 2020? What are the skills one needs to have to be a Data Analyst? There are many such questions which strike our mind when we talk about this profession.Let's walk through the answers to all the questions to ensure we have a clear picture in our mind.What is Data analytics?Information collected from different sources is used to make informed decisions for the organization, and is analyzed for some specific goals through Data Analysis. Data Analysis is not only used for research and analysis; but it helps organizations learn more about their customers, develop marketing strategies and optimize product development, just to name a few areas where it makes an impact.To be precise, there are four types of Data Analytics:Descriptive Analytics: - In this type of analytics, analysts examine the past data like monthly sales, monthly revenue, website traffic and more to find out the trend. They then draft a description or a summary of the performance of the firm or website. This type of analytics uses arithmetic operations, mean, median, max, percentage and other statistical summaries.Diagnostic Analytics:- As the name suggests, here we diagnose the data and find out the reasons behind any particular trend, issue or scenario.  If a company is faced with any negative data then this type of analysis will help them to find out the main reasons/causes for the decline in the performance, against which decisions and actions can be taken.Predictive Analytics:-  This type of analytics helps in predicting the future outcome by analyzing the past data and trends. It will help companies to take proactive actions for the better outcomes. Not just this, but predictive analysis also helps us forecast the sales, demand, fraud, failures and set our budgets and other resources accordingly.  Prescriptive Analytics:- This type of analytics helps in determining what action the company should take next in response to the situation, to keep the business going and growing.Why do we need Data Analysts?Organizations across different fields or sectors rely on data analysis to take important decisions for the development of a new product, to forecast sales for the near future, or find out about entry into new markets or new customers to target. Data analysis is also used to analyze the business performance based on the present data and find out various inefficiencies in the organizations. Not only industries or businesses use data analysis, but it is also used by different political parties and other groups to find out about opportunities as well as challenges.What does a data analyst do?There are several functions which an analyst performs, but some of the functions may also depends on the type of business and organization. Generally, a data analyst performs the following responsibilities:Data collection from various sources like primary sources and secondary sources and arranging the data in a proper sequence.Cleaning and processing the data as per requirement. A data analyst may be required to treat missing values, clean invalid or wrong data and remove unwanted information.Using different kind of statistical tools like R, Python, SPSS or SAS, to interpret the data collected.Adjusting the data according to the upcoming trends or changes like seasonal trends and then making interpretations.Preparing a data analysis report.Identifying opportunities and threats from the analyzed data and apprising the same to the organization.Now that you know what areas a Data Analyst works on, let us move to the skills and knowledge you would require to get started in this field.What are the skills necessary to be a Data Analyst?Broadly, a data analyst needs to have two type of skills at a broader level:Technical skills - Knowledge of different technical languages and tools like R, SQL, Microsoft Excel, Tableau, Mathematical skills, statistical skills and data visualization skills. These technical skills would help an analyst actually use the data and visualize the final outcome in a form that could be beneficial for the firm. This may include tables, graphs, charts, and more.   Decision making – This is extremely necessary to present the outcome and take the executives through the various changes, trends, demand, and downfall. Deep analysis is required to be able to take logical, factual and beneficial decisions for the firm. Data analysts must have the ability to think strategically and get a 360 degree view of the situation, before suggesting the way forward.After acquiring the above mentioned skills, it is very much required to keep yourself updated with the latest trends in the industry, so a mindset of continuous learning is a must.How to become a data analyst in 2021?The year 2020 changed all the definitions of a business and its processes. COVID-19 put companies across the world in a tailspin, forcing them to rethink their business strategies in order to cope with the evolving challenges thrown up by the pandemic. Some companies that were market leaders in their domain were unable to cope, and many had to even close down. The question therefore arises, in such an uncertain scenario, with challenges around every corner, is it even prudent to consider stepping into the role of a Data Analyst at this juncture?   The answer to this is, “YES”. This is the best time to be a data analyst because organizations everywhere are looking for expert Analysts who can guide them in making the right decisions, helping the organization to survive through the pandemic and beyond. Data analysts can perform detailed sales forecasting, or carry out a complete market analysis to make the right predictions for future growth. Companies need to prepare smart strategies for sales and marketing, to survive and thrive in the long run.If you want to shape your career in data analytics then You must have a degree in Mathematics, Economics, Engineering, Statistics or in a field which emphasizes on statistical and analytical skills. You must know some data analytics tools or skills which are mentioned above like R, SQL, Tableau, Data Warehousing, Data visualization, Data mining and advanced Microsoft Excel. You must consider some good certifications in the above-mentioned skills.   You may also consider a master’s degree in the field of data analytics.Let us now take you through the scope of Data Analysis in 2021.What is the scope of data analytics in 2021?The world is witnessing a surge in demand for data analytics services. According to a report, it is expected that there will be 250,000 new openings in the Data Analytics field in 2021, which is almost 60% higher than the demand in 2019-20. To stay ahead of the competition, organizations are employing Data Analysts and the demand for experts in the field is only set to rise. According to another report published in 2019, there were 150000 jobs which were vacant in the Data Analytics sector because of lack of available talent. This is a lucrative field, and those professionals who have expertise and experience can easily climb to the top in a short time. A report by IBM predicts that by 2021, Data Science and Analytics jobs would grow to nearly 350,000.What are the sectors in which Data Science jobs are expected to grow in India in 2021?Though the need for data analytics is growing across every sector, there are a few sectors that are more in-demand than others. These include:Aviation sector: uses data analysis for pricing and route optimization. Agriculture sector: analyses data to forecast the output and pricing. Cyber security: Global companies are adopting data engineering and data analysis for anomaly and intrusion detection. Genomics: Data analytics is used to study the sequence of genomes. It is heavily used to diagnose abnormalities and identify diseases.Conclusion If you would like to enter the field of Data Analytics, there’s no time like now! Data is useless without the right professional to analyze it. Leading companies leverage the power of analytics to improve their decision making and fuel business growth, and are always looking to employ bright and talented professionals with the capabilities they need.  Opportunities are plentiful and the rewards are immense, so take the first step and start honing all the skills that can make you fulfil your dream!

How To Become A Data Aanalyst In 2021?

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How To Become A Data Aanalyst In 2021?

In 2020, Data Analysis has become one of the core functions in any organization. This is a highly sought-after role that has evolved immensely in the past few years. But what is Data Analysis?  What do Data Analysts do? How to become a Data Analyst in 2020? What are the skills one needs to have to be a Data Analyst? There are many such questions which strike our mind when we talk about this profession.

Data Science Process

Let's walk through the answers to all the questions to ensure we have a clear picture in our mind.

What is Data analytics?

Information collected from different sources is used to make informed decisions for the organization, and is analyzed for some specific goals through Data Analysis. Data Analysis is not only used for research and analysis; but it helps organizations learn more about their customers, develop marketing strategies and optimize product development, just to name a few areas where it makes an impact.

To be precise, there are four types of Data Analytics:

What is Data analytics?

  1. Descriptive Analytics: - In this type of analytics, analysts examine the past data like monthly sales, monthly revenue, website traffic and more to find out the trend. They then draft a description or a summary of the performance of the firm or website. This type of analytics uses arithmetic operations, mean, median, max, percentage and other statistical summaries.
  2. Diagnostic Analytics:- As the name suggests, here we diagnose the data and find out the reasons behind any particular trend, issue or scenario.  If a company is faced with any negative data then this type of analysis will help them to find out the main reasons/causes for the decline in the performance, against which decisions and actions can be taken.
  3. Predictive Analytics:-  This type of analytics helps in predicting the future outcome by analyzing the past data and trends. It will help companies to take proactive actions for the better outcomes. Not just this, but predictive analysis also helps us forecast the sales, demand, fraud, failures and set our budgets and other resources accordingly.  
  4. Prescriptive Analytics:- This type of analytics helps in determining what action the company should take next in response to the situation, to keep the business going and growing.

Prescriptive Analytics

Why do we need Data Analysts?

Organizations across different fields or sectors rely on data analysis to take important decisions for the development of a new product, to forecast sales for the near future, or find out about entry into new markets or new customers to target. Data analysis is also used to analyze the business performance based on the present data and find out various inefficiencies in the organizations. Not only industries or businesses use data analysis, but it is also used by different political parties and other groups to find out about opportunities as well as challenges.

What does a data analyst do?

There are several functions which an analyst performs, but some of the functions may also depends on the type of business and organization. Generally, a data analyst performs the following responsibilities:

  1. Data collection from various sources like primary sources and secondary sources and arranging the data in a proper sequence.
  2. Cleaning and processing the data as per requirement. A data analyst may be required to treat missing values, clean invalid or wrong data and remove unwanted information.
  3. Using different kind of statistical tools like R, Python, SPSS or SAS, to interpret the data collected.
  4. Adjusting the data according to the upcoming trends or changes like seasonal trends and then making interpretations.
  5. Preparing a data analysis report.
  6. Identifying opportunities and threats from the analyzed data and apprising the same to the organization.

Now that you know what areas a Data Analyst works on, let us move to the skills and knowledge you would require to get started in this field.

What are the skills necessary to be a Data Analyst?

Broadly, a data analyst needs to have two type of skills at a broader level:

  1. Technical skills - Knowledge of different technical languages and tools like R, SQL, Microsoft Excel, Tableau, Mathematical skills, statistical skills and data visualization skills. These technical skills would help an analyst actually use the data and visualize the final outcome in a form that could be beneficial for the firm. This may include tables, graphs, charts, and more.  
  2.  Decision making – This is extremely necessary to present the outcome and take the executives through the various changes, trends, demand, and downfall. Deep analysis is required to be able to take logical, factual and beneficial decisions for the firm. Data analysts must have the ability to think strategically and get a 360 degree view of the situation, before suggesting the way forward.

After acquiring the above mentioned skills, it is very much required to keep yourself updated with the latest trends in the industry, so a mindset of continuous learning is a must.

How to become a data analyst in 2021?

The year 2020 changed all the definitions of a business and its processes. COVID-19 put companies across the world in a tailspin, forcing them to rethink their business strategies in order to cope with the evolving challenges thrown up by the pandemic. Some companies that were market leaders in their domain were unable to cope, and many had to even close down. 

The question therefore arises, in such an uncertain scenario, with challenges around every corner, is it even prudent to consider stepping into the role of a Data Analyst at this juncture?  

The answer to this is, “YES”. This is the best time to be a data analyst because organizations everywhere are looking for expert Analysts who can guide them in making the right decisions, helping the organization to survive through the pandemic and beyond. Data analysts can perform detailed sales forecasting, or carry out a complete market analysis to make the right predictions for future growth. Companies need to prepare smart strategies for sales and marketing, to survive and thrive in the long run.

If you want to shape your career in data analytics then

  1.  You must have a degree in Mathematics, Economics, Engineering, Statistics or in a field which emphasizes on statistical and analytical skills.
  2.  You must know some data analytics tools or skills which are mentioned above like R, SQL, Tableau, Data Warehousing, Data visualization, Data mining and advanced Microsoft Excel.
  3.  You must consider some good certifications in the above-mentioned skills.  
  4.  You may also consider a master’s degree in the field of data analytics.

Let us now take you through the scope of Data Analysis in 2021.

What is the scope of data analytics in 2021?

The world is witnessing a surge in demand for data analytics services. According to a report, it is expected that there will be 250,000 new openings in the Data Analytics field in 2021, which is almost 60% higher than the demand in 2019-20. To stay ahead of the competition, organizations are employing Data Analysts and the demand for experts in the field is only set to rise. 

According to another report published in 2019, there were 150000 jobs which were vacant in the Data Analytics sector because of lack of available talent. This is a lucrative field, and those professionals who have expertise and experience can easily climb to the top in a short time. A report by IBM predicts that by 2021, Data Science and Analytics jobs would grow to nearly 350,000.

What are the sectors in which Data Science jobs are expected to grow in India in 2021?

What are the sectors in which Data Science jobs are expected to grow in India in 2021

Though the need for data analytics is growing across every sector, there are a few sectors that are more in-demand than others. These include:

  1. Aviation sector: uses data analysis for pricing and route optimization.
  2. Agriculture sector: analyses data to forecast the output and pricing.
  3. Cyber security: Global companies are adopting data engineering and data analysis for anomaly and intrusion detection.
  4. Genomics: Data analytics is used to study the sequence of genomes. It is heavily used to diagnose abnormalities and identify diseases.

Conclusion

If you would like to enter the field of Data Analytics, there’s no time like now! Data is useless without the right professional to analyze it. Leading companies leverage the power of analytics to improve their decision making and fuel business growth, and are always looking to employ bright and talented professionals with the capabilities they need.  Opportunities are plentiful and the rewards are immense, so take the first step and start honing all the skills that can make you fulfil your dream!

Dipayan

Dipayan Ghatak

Project Manager

Leading Projects across geographies in Microsoft Consultant Services.

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Role of Unstructured Data in Data Science

Data has become the new game changer for businesses. Typically, data scientists categorize data into three broad divisions - structured, semi-structured, and unstructured data. In this article, you will get to know about unstructured data, sources of unstructured data, unstructured data vs. structured data, the use of structured and unstructured data in machine learning, and the difference between structured and unstructured data. Let us first understand what is unstructured data with examples. What is unstructured data? Unstructured data is a kind of data format where there is no organized form or type of data. Videos, texts, images, document files, audio materials, email contents and more are considered to be unstructured data. It is the most copious form of business data, and cannot be stored in a structured database or relational database. Some examples of unstructured data are the photos we post on social media platforms, the tagging we do, the multimedia files we upload, and the documents we share. Seagate predicts that the global data-sphere will expand to 163 zettabytes by 2025, where most of the data will be in the unstructured format. Characteristics of Unstructured DataUnstructured data cannot be organized in a predefined fashion, and is not a homogenous data model. This makes it difficult to manage. Apart from that, these are the other characteristics of unstructured data. You cannot store unstructured data in the form of rows and columns as we do in a database table. Unstructured data is heterogeneous in structure and does not have any specific data model. The creation of such data does not follow any semantics or habits. Due to the lack of any particular sequence or format, it is difficult to manage. Such data does not have an identifiable structure. Sources of Unstructured Data There are various sources of unstructured data. Some of them are: Content websites Social networking sites Online images Memos Reports and research papers Documents, spreadsheets, and presentations Audio mining, chatbots Surveys Feedback systems Advantages of Unstructured Data Unstructured data has become exceptionally easy to store because of MongoDB, Cassandra, or even using JSON. Modern NoSQL databases and software allows data engineers to collect and extract data from various sources. There are numerous benefits that enterprises and businesses can gain from unstructured data. These are: With the advent of unstructured data, we can store data that lacks a proper format or structure. There is no fixed schema or data structure for storing such data, which gives flexibility in storing data of different genres. Unstructured data is much more portable by nature. Unstructured data is scalable and flexible to store. Database systems like MongoDB, Cassandra, etc., can easily handle the heterogeneous properties of unstructured data. Different applications and platforms produce unstructured data that becomes useful in business intelligence, unstructured data analytics, and various other fields. Unstructured data analysis allows finding comprehensive data stories from data like email contents, website information, social media posts, mobile data, cache files and more. Unstructured data, along with data analytics, helps companies improve customer experience. Detection of the taste of consumers and their choices becomes easy because of unstructured data analysis. Disadvantages of Unstructured data Storing and managing unstructured data is difficult because there is no proper structure or schema. Data indexing is also a substantial challenge and hence becomes unclear due to its disorganized nature. Search results from an unstructured dataset are also not accurate because it does not have predefined attributes. Data security is also a challenge due to the heterogeneous form of data. Problems faced and solutions for storing unstructured data. Until recently, it was challenging to store, evaluate, and manage unstructured data. But with the advent of modern data analysis tools, algorithms, CAS (content addressable storage system), and big data technologies, storage and evaluation became easy. Let us first take a look at the various challenges used for storing unstructured data. Storing unstructured data requires a large amount of space. Indexing of unstructured data is a hectic task. Database operations such as deleting and updating become difficult because of the disorganized nature of the data. Storing and managing video, audio, image file, emails, social media data is also challenging. Unstructured data increases the storage cost. For solving such issues, there are some particular approaches. These are: CAS system helps in storing unstructured data efficiently. We can preserve unstructured data in XML format. Developers can store unstructured data in an RDBMS system supporting BLOB. We can convert unstructured data into flexible formats so that evaluating and storage becomes easy. Let us now understand the differences between unstructured data vs. structured data. Unstructured Data Vs. Structured Data In this section, we will understand the difference between structured and unstructured data with examples. STRUCTUREDUNSTRUCTUREDStructured data resides in an organized format in a typical database.Unstructured data cannot reside in an organized format, and hence we cannot store it in a typical database.We can store structured data in SQL database tables having rows and columns.Storing and managing unstructured data requires specialized databases, along with a variety of business intelligence and analytics applications.It is tough to scale a database schema.It is highly scalable.Structured data gets generated in colleges, universities, banks, companies where people have to deal with names, date of birth, salary, marks and so on.We generate or find unstructured data in social media platforms, emails, analyzed data for business intelligence, call centers, chatbots and so on.Queries in structured data allow complex joining.Unstructured data allows only textual queries.The schema of a structured dataset is less flexible and dependent.An unstructured dataset is flexible but does not have any particular schema.It has various concurrency techniques.It has no concurrency techniques.We can use SQL, MySQL, SQLite, Oracle DB, Teradata to store structured data.We can use NoSQL (Not Only SQL) to store unstructured data.Types of Unstructured Data Do you have any idea just how much of unstructured data we produce and from what sources? Unstructured data includes all those forms of data that we cannot actively manage in an RDBMS system that is a transactional system. We can store structured data in the form of records. But this is not the case with unstructured data. Before the advent of object-based storage, most of the unstructured data was stored in file-based systems. Here are some of the types of unstructured data. Rich media content: Entertainment files, surveillance data, multimedia email attachments, geospatial data, audio files (call center and other recorded audio), weather reports (graphical), etc., comes under this genre. Document data: Invoices, text-file records, email contents, productivity applications, etc., are included under this genre. Internet of Things (IoT) data: Ticker data, sensor data, data from other IoT devices come under this genre. Apart from all these, data from business intelligence and analysis, machine learning datasets, and artificial intelligence data training datasets are also a separate genre of unstructured data. Examples of Unstructured Data There are various sources from where we can obtain unstructured data. The prominent use of this data is in unstructured data analytics. Let us now understand what are some examples of unstructured data and their sources – Healthcare industries generate a massive volume of human as well as machine-generated unstructured data. Human-generated unstructured data could be in the form of patient-doctor or patient-nurse conversations, which are usually recorded in audio or text formats. Unstructured data generated by machines includes emergency video camera footage, surgical robots, data accumulated from medical imaging devices like endoscopes, laparoscopes and more.  Social Media is an intrinsic entity of our daily life. Billions of people come together to join channels, share different thoughts, and exchange information with their loved ones. They create and share such data over social media platforms in the form of images, video clips, audio messages, tagging people (this helps companies to map relations between two or more people), entertainment data, educational data, geolocations, texts, etc. Other spectra of data generated from social media platforms are behavior patterns, perceptions, influencers, trends, news, and events. Business and corporate documents generate a multitude of unstructured data such as emails, presentations, reports containing texts, images, presentation reports, video contents, feedback and much more. These documents help to create knowledge repositories within an organization to make better implicit operations. Live chat, video conferencing, web meeting, chatbot-customer messages, surveillance data are other prominent examples of unstructured data that companies can cultivate to get more insights into the details of a person. Some prominent examples of unstructured data used in enterprises and organizations are: Reports and documents, like Word files or PDF files Multimedia files, such as audio, images, designed texts, themes, and videos System logs Medical images Flat files Scanned documents (which are images that hold numbers and text – for example, OCR) Biometric data Unstructured Data Analytics Tools  You might be wondering what tools can come into use to gather and analyze information that does not have a predefined structure or model. Various tools and programming languages use structured and unstructured data for machine learning and data analysis. These are: Tableau MonkeyLearn Apache Spark SAS Python MS. Excel RapidMiner KNIME QlikView Python programming R programming Many cloud services (like Amazon AWS, Microsoft Azure, IBM Cloud, Google Cloud) also offer unstructured data analysis solutions bundled with their services. How to analyze unstructured data? In the past, the process of storage and analysis of unstructured data was not well defined. Enterprises used to carry out this kind of analysis manually. But with the advent of modern tools and programming languages, most of the unstructured data analysis methods became highly advanced. AI-powered tools use algorithms designed precisely to help to break down unstructured data for analysis. Unstructured data analytics tools, along with Natural language processing (NLP) and machine learning algorithms, help advanced software tools analyze and extract analytical data from the unstructured datasets. Before using these tools for analyzing unstructured data, you must properly go through a few steps and keep these points in mind. Set a clear goal for analyzing the data: It is essential to clear your intention about what insights you want to extract from your unstructured data. Knowing this will help you distinguish what type of data you are planning to accumulate. Collect relevant data: Unstructured data is available everywhere, whether it's a social media platform, online feedback or reviews, or a survey form. Depending on the previous point, that is your goal - you have to be precise about what data you want to collect in real-time. Also, keep in mind whether your collected details are relevant or not. Clean your data: Data cleaning or data cleansing is a significant process to detect corrupt or irrelevant data from the dataset, followed by modifying or deleting the coarse and sloppy data. This phase is also known as the data-preprocessing phase, where you have to reduce the noise, carry out data slicing for meaningful representation, and remove unnecessary data. Use Technology and tools: Once you perform the data cleaning, it is time to utilize unstructured data analysis tools to prepare and cultivate the insights from your data. Technologies used for unstructured data storage (NoSQL) can help in managing your flow of data. Other tools and programming libraries like Tableau, Matplotlib, Pandas, and Google Data Studio allows us to extract and visualize unstructured data. Data can be visualized and presented in the form of compelling graphs, plots, and charts. How to Extract information from Unstructured Data? With the growth in digitization during the information era, repetitious transactions in data cause data flooding. The exponential accretion in the speed of digital data creation has brought a whole new domain of understanding user interaction with the online world. According to Gartner, 80% of the data created by an organization or its application is unstructured. While extracting exact information through appropriate analysis of organized data is not yet possible, even obtaining a decent sense of this unstructured data is quite tough. Until now, there are no perfect tools to analyze unstructured data. But algorithms and tools designed using machine learning, Natural language processing, Deep learning, and Graph Analysis (a mathematical method for estimating graph structures) help us to get the upper hand in extracting information from unstructured data. Other neural network models like modern linguistic models follow unsupervised learning techniques to gain a good 'knowledge' about the unstructured dataset before going into a specific supervised learning step. AI-based algorithms and technologies are capable enough to extract keywords, locations, phone numbers, analyze image meaning (through digital image processing). We can then understand what to evaluate and identify information that is essential to your business. ConclusionUnstructured data is found abundantly from sources like documents, records, emails, social media posts, feedbacks, call-records, log-in session data, video, audio, and images. Manually analyzing unstructured data is very time-consuming and can be very boring at the same time. With the growth of data science and machine learning algorithms and models, it has become easy to gather and analyze insights from unstructured information.  According to some research, data analytics tools like MonkeyLearn Studio, Tableau, RapidMiner help analyze unstructured data 1200x faster than the manual approach. Analyzing such data will help you learn more about your customers as well as competitors. Text analysis software, along with machine learning models, will help you dig deep into such datasets and make you gain an in-depth understanding of the overall scenario with fine-grained analyses.
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Role of Unstructured Data in Data Science

Data has become the new game changer for busines... Read More

What Is Statistical Analysis and Its Business Applications?

Statistics is a science concerned with collection, analysis, interpretation, and presentation of data. In Statistics, we generally want to study a population. You may consider a population as a collection of things, persons, or objects under experiment or study. It is usually not possible to gain access to all of the information from the entire population due to logistical reasons. So, when we want to study a population, we generally select a sample. In sampling, we select a portion (or subset) of the larger population and then study the portion (or the sample) to learn about the population. Data is the result of sampling from a population.Major ClassificationThere are two basic branches of Statistics – Descriptive and Inferential statistics. Let us understand the two branches in brief. Descriptive statistics Descriptive statistics involves organizing and summarizing the data for better and easier understanding. Unlike Inferential statistics, Descriptive statistics seeks to describe the data, however, it does not attempt to draw inferences from the sample to the whole population. We simply describe the data in a sample. It is not developed on the basis of probability unlike Inferential statistics. Descriptive statistics is further broken into two categories – Measure of Central Tendency and Measures of Variability. Inferential statisticsInferential statistics is the method of estimating the population parameter based on the sample information. It applies dimensions from sample groups in an experiment to contrast the conduct group and make overviews on the large population sample. Please note that the inferential statistics are effective and valuable only when examining each member of the group is difficult. Let us understand Descriptive and Inferential statistics with the help of an example. Task – Suppose, you need to calculate the score of the players who scored a century in a cricket tournament.  Solution: Using Descriptive statistics you can get the desired results.   Task – Now, you need the overall score of the players who scored a century in the cricket tournament.  Solution: Applying the knowledge of Inferential statistics will help you in getting your desired results.  Top Five Considerations for Statistical Data AnalysisData can be messy. Even a small blunder may cost you a fortune. Therefore, special care when working with statistical data is of utmost importance. Here are a few key takeaways you must consider to minimize errors and improve accuracy. Define the purpose and determine the location where the publication will take place.  Understand the assets to undertake the investigation. Understand the individual capability of appropriately managing and understanding the analysis.  Determine whether there is a need to repeat the process.  Know the expectation of the individuals evaluating reviewing, committee, and supervision. Statistics and ParametersDetermining the sample size requires understanding statistics and parameters. The two being very closely related are often confused and sometimes hard to distinguish.  StatisticsA statistic is merely a portion of a target sample. It refers to the measure of the values calculated from the population.  A parameter is a fixed and unknown numerical value used for describing the entire population. The most commonly used parameters are: Mean Median Mode Mean :  The mean is the average or the most common value in a data sample or a population. It is also referred to as the expected value. Formula: Sum of the total number of observations/the number of observations. Experimental data set: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20  Calculating mean:   (2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20)/10  = 110/10   = 11 Median:  In statistics, the median is the value separating the higher half from the lower half of a data sample, a population, or a probability distribution. It’s the mid-value obtained by arranging the data in increasing order or descending order. Formula:  Let n be the data set (increasing order) When data set is odd: Median = n+1/2th term Case-I: (n is odd)  Experimental data set = 1, 2, 3, 4, 5  Median (n = 5) = [(5 +1)/2]th term      = 6/2 term       = 3rd term   Therefore, the median is 3 When data set is even: Median = [n/2th + (n/2 + 1)th] /2 Case-II: (n is even)  Experimental data set = 1, 2, 3, 4, 5, 6   Median (n = 6) = [n/2th + (n/2 + 1)th]/2     = ( 6/2th + (6/2 +1)th]/2     = (3rd + 4th)/2      = (3 + 4)/2      = 7/2      = 3.5  Therefore, the median is 3.5 Mode: The mode is the value that appears most often in a set of data or a population. Experimental data set= 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4,4,5, 6  Mode = 3 (Since 3 is the most repeated element in the sequence.) Terms Used to Describe DataWhen working with data, you will need to search, inspect, and characterize them. To understand the data in a tech-savvy and straightforward way, we use a few statistical terms to denote them individually or in groups.  The most frequently used terms used to describe data include data point, quantitative variables, indicator, statistic, time-series data, variable, data aggregation, time series, dataset, and database. Let us define each one of them in brief: Data points: These are the numerical files formed and organized for interpretations. Quantitative variables: These variables present the information in digit form.  Indicator: An indicator explains the action of a community's social-economic surroundings.  Time-series data: The time-series defines the sequential data.  Data aggregation: A group of data points and data set. Database: A group of arranged information for examination and recovery.  Time-series: A set of measures of a variable documented over a specified time. Step-by-Step Statistical Analysis ProcessThe statistical analysis process involves five steps followed one after another. Step 1: Design the study and find the population of the study. Step 2: Collect data as samples. Step 3: Describe the data in the sample. Step 4: Make inferences with the help of samples and calculations Step 5: Take action Data distributionData distribution is an entry that displays entire imaginable readings of data. It shows how frequently a value occurs. Distributed data is always in ascending order, charts, and graphs enabling visibility of measurements and frequencies. The distribution function displaying the density of values of reading is known as the probability density function. Percentiles in data distributionA percentile is the reading in a distribution with a specified percentage of clarifications under it.  Let us understand percentiles with the help of an example.  Suppose you have scored 90th percentile on a math test. A basic interpretation is that merely 4-5% of the scores were higher than your scores. Right? The median is 50th percentile because the assumed 50% of the values are higher than the median. Dispersion Dispersion explains the magnitude of distribution readings anticipated for a specific variable and multiple unique statistics like range, variance, and standard deviation. For instance, high values of a data set are widely scattered while small values of data are firmly clustered. Histogram The histogram is a pictorial display that arranges a group of data facts into user detailed ranges. A histogram summarizes a data series into a simple interpreted graphic by obtaining many data facts and combining them into reasonable ranges. It contains a variety of results into columns on the x-axis. The y axis displays percentages of data for each column and is applied to picture data distributions. Bell Curve distribution Bell curve distribution is a pictorial representation of a probability distribution whose fundamental standard deviation obtained from the mean makes the bell, shaped curving. The peak point on the curve symbolizes the maximum likely occasion in a pattern of data. The other possible outcomes are symmetrically dispersed around the mean, making a descending sloping curve on both sides of the peak. The curve breadth is therefore known as the standard deviation. Hypothesis testingHypothesis testing is a process where experts experiment with a theory of a population parameter. It aims to evaluate the credibility of a hypothesis using sample data. The five steps involved in hypothesis testing are:  Identify the no outcome hypothesis.  (A worthless or a no-output hypothesis has no outcome, connection, or dissimilarities amongst many factors.) Identify the alternative hypothesis.  Establish the importance level of the hypothesis.  Estimate the experiment statistic and equivalent P-value. P-value explains the possibility of getting a sample statistic.  Sketch a conclusion to interpret into a report about the alternate hypothesis. Types of variablesA variable is any digit, amount, or feature that is countable or measurable. Simply put, it is a variable characteristic that varies. The six types of variables include the following: Dependent variableA dependent variable has values that vary according to the value of another variable known as the independent variable.  Independent variableAn independent variable on the other side is controllable by experts. Its reports are recorded and equated.  Intervening variableAn intervening variable explicates fundamental relations between variables. Moderator variableA moderator variable upsets the power of the connection between dependent and independent variables.  Control variableA control variable is anything restricted to a research study. The values are constant throughout the experiment. Extraneous variableExtraneous variable refers to the entire variables that are dependent but can upset experimental outcomes. Chi-square testChi-square test records the contrast of a model to actual experimental data. Data is unsystematic, underdone, equally limited, obtained from independent variables, and a sufficient sample. It relates the size of any inconsistencies among the expected outcomes and the actual outcomes, provided with the sample size and the number of variables in the connection. Types of FrequenciesFrequency refers to the number of repetitions of reading in an experiment in a given time. Three types of frequency distribution include the following: Grouped, ungrouped Cumulative, relative Relative cumulative frequency distribution. Features of FrequenciesThe calculation of central tendency and position (median, mean, and mode). The measure of dispersion (range, variance, and standard deviation). Degree of symmetry (skewness). Peakedness (kurtosis). Correlation MatrixThe correlation matrix is a table that shows the correlation coefficients of unique variables. It is a powerful tool that summarises datasets points and picture sequences in the provided data. A correlation matrix includes rows and columns that display variables. Additionally, the correlation matrix exploits in aggregation with other varieties of statistical analysis. Inferential StatisticsInferential statistics use random data samples for demonstration and to create inferences. They are measured when analysis of each individual of a whole group is not likely to happen. Applications of Inferential StatisticsInferential statistics in educational research is not likely to sample the entire population that has summaries. For instance, the aim of an investigation study may be to obtain whether a new method of learning mathematics develops mathematical accomplishment for all students in a class. Marketing organizations: Marketing organizations use inferential statistics to dispute a survey and request inquiries. It is because carrying out surveys for all the individuals about merchandise is not likely. Finance departments: Financial departments apply inferential statistics for expected financial plan and resources expenses, especially when there are several indefinite aspects. However, economists cannot estimate all that use possibility. Economic planning: In economic planning, there are potent methods like index figures, time series investigation, and estimation. Inferential statistics measures national income and its components. It gathers info about revenue, investment, saving, and spending to establish links among them. Key TakeawaysStatistical analysis is the gathering and explanation of data to expose sequences and tendencies.   Two divisions of statistical analysis are statistical and non-statistical analyses.  Descriptive and Inferential statistics are the two main categories of statistical analysis. Descriptive statistics describe data, whereas Inferential statistics equate dissimilarities between the sample groups.  Statistics aims to teach individuals how to use restricted samples to generate intellectual and precise results for a large group.   Mean, median, and mode are the statistical analysis parameters used to measure central tendency.   Conclusion Statistical analysis is the procedure of gathering and examining data to recognize sequences and trends. It uses random samples of data obtained from a population to demonstrate and create inferences on a group. Inferential statistics applies economic planning with potent methods like index figures, time series investigation, and estimation.  Statistical analysis finds its applications in all the major sectors – marketing, finance, economic, operations, and data mining. Statistical analysis aids marketing organizations in disputing a survey and requesting inquiries concerning their merchandise. 
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What Is Statistical Analysis and Its Business Appl...

Statistics is a science concerned with collection,... Read More

Measures of Dispersion: All You Need to Know

What is Dispersion in StatisticsDispersion in statistics is a way of describing how spread out a set of data is. Dispersion is the state of data getting dispersed, stretched, or spread out in different categories. It involves finding the size of distribution values that are expected from the set of data for the specific variable. The statistical meaning of dispersion is “numeric data that is likely to vary at any instance of average value assumption”.Dispersion of data in Statistics helps one to easily understand the dataset by classifying them into their own specific dispersion criteria like variance, standard deviation, and ranging.Dispersion is a set of measures that helps one to determine the quality of data in an objectively quantifiable manner.The measure of dispersion contains almost the same unit as the quantity being measured. There are many Measures of Dispersion found which help us to get more insights into the data: Range Variance Standard Deviation Skewness IQR  Image SourceTypes of Measure of DispersionThe Measure of Dispersion is divided into two main categories and offer ways of measuring the diverse nature of data. It is mainly used in biological statistics. We can easily classify them by checking whether they contain units or not. So as per the above, we can divide the data into two categories which are: Absolute Measure of Dispersion Relative Measure of DispersionAbsolute Measure of DispersionAbsolute Measure of Dispersion is one with units; it has the same unit as the initial dataset. Absolute Measure of Dispersion is expressed in terms of the average of the dispersion quantities like Standard or Mean deviation. The Absolute Measure of Dispersion can be expressed  in units such as Rupees, Centimetre, Marks, kilograms, and other quantities that are measured depending on the situation. Types of Absolute Measure of Dispersion: Range: Range is the measure of the difference between the largest and smallest value of the data variability. The range is the simplest form of Measure of Dispersion. Example: 1,2,3,4,5,6,7 Range = Highest value – Lowest value   = ( 7 – 1 ) = 6 Mean (μ): Mean is calculated as the average of the numbers. To calculate the Mean, add all the outcomes and then divide it with the total number of terms. Example: 1,2,3,4,5,6,7,8 Mean = (sum of all the terms / total number of terms)                = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8) / 8                = 36 / 8                = 4.5 Variance (σ2): In simple terms, the variance can be calculated by obtaining the sum of the squared distance of each term in the distribution from the Mean, and then dividing this by the total number of the terms in the distribution.  It basically shows how far a number, for example, a student’s mark in an exam, is from the Mean of the entire class. Formula: (σ2) = ∑ ( X − μ)2 / N Standard Deviation: Standard Deviation can be represented as the square root of Variance. To find the standard deviation of any data, you need to find the variance first. Formula: Standard Deviation = √σ Quartile: Quartiles divide the list of numbers or data into quarters. Quartile Deviation: Quartile Deviation is the measure of the difference between the upper and lower quartile. This measure of deviation is also known as interquartile range. Formula: Interquartile Range: Q3 – Q1. Mean deviation: Mean Deviation is also known as an average deviation; it can be computed using the Mean or Median of the data. Mean deviation is represented as the arithmetic deviation of a different item that follows the central tendency. Formula: As mentioned, the Mean Deviation can be calculated using Mean and Median. Mean Deviation using Mean: ∑ | X – M | / N Mean Deviation using Median: ∑ | X – X1 | / N Relative Measure of DispersionRelative Measures of dispersion are the values without units. A relative measure of dispersion is used to compare the distribution of two or more datasets.  The definition of the Relative Measure of Dispersion is the same as the Absolute Measure of Dispersion; the only difference is the measuring quantity.  Types of Relative Measure of Dispersion: Relative Measure of Dispersion is the calculation of the co-efficient of Dispersion, where 2 series are compared, which differ widely in their average.  The main use of the co-efficient of Dispersion is when 2 series with different measurement units are compared.  1. Co-efficient of Range: it is calculated as the ratio of the difference between the largest and smallest terms of the distribution, to the sum of the largest and smallest terms of the distribution.  Formula: L – S / L + S  where L = largest value S= smallest value 2. Co-efficient of Variation: The coefficient of variation is used to compare the 2 data with respect to homogeneity or consistency.  Formula: C.V = (σ / X) 100 X = standard deviation  σ = mean 3. Co-efficient of Standard Deviation: The co-efficient of Standard Deviation is the ratio of standard deviation with the mean of the distribution of terms.  Formula: σ = ( √( X – X1)) / (N - 1) Deviation = ( X – X1)  σ = standard deviation  N= total number  4. Co-efficient of Quartile Deviation: The co-efficient of Quartile Deviation is the ratio of the difference between the upper quartile and the lower quartile to the sum of the upper quartile and lower quartile.  Formula: ( Q3 – Q3) / ( Q3 + Q1) Q3 = Upper Quartile  Q1 = Lower Quartile 5. Co-efficient of Mean Deviation: The co-efficient of Mean Deviation can be computed using the mean or median of the data. Mean Deviation using Mean: ∑ | X – M | / N Mean Deviation using Mean: ∑ | X – X1 | / N Why dispersion is important in a statisticThe knowledge of dispersion is vital in the understanding of statistics. It helps to understand concepts like the diversification of the data, how the data is spread, how it is maintained, and maintaining the data over the central value or central tendency. Moreover, dispersion in statistics provides us with a way to get better insights into data distribution. For example,  3 distinct samples can have the same Mean, Median, or Range but completely different levels of variability. How to Calculate DispersionDispersion can be easily calculated using various dispersion measures, which are already mentioned in the types of Measure of Dispersion described above. Before measuring the data, it is important to understand the diversion of the terms and variation. One can use the following method to calculate the dispersion: Mean Standard deviation Variance Quartile deviation For example, let us consider two datasets: Data A:97,98,99,100,101,102,103  Data B: 70,80,90,100,110,120,130 On calculating the mean and median of the two datasets, both have the same value, which is 100. However, the rest of the dispersion measures are totally different as measured by the above methods.  The range of B is 10 times higher, for instance. How to represent Dispersion in Statistics Dispersion in Statistics can be represented in the form of graphs and pie-charts. Some of the different ways used include: Dot Plots Box Plots Stems Leaf Plots Example: What is the variance of the values 3,8,6,10,12,9,11,10,12,7?  Variation of the values can be calculated using the following formula: (σ2) = ∑ ( X − μ)2 / N (σ2) = 7.36 What is an example of dispersion? One of the examples of dispersion outside the world of statistics is the rainbow- where white light is split into 7 different colours separated via wavelengths.  Some statistical ways of measuring it are- Standard deviation Range Mean absolute difference Median absolute deviation Interquartile change Average deviation Conclusion: Dispersion in statistics refers to the measure of variability of data or terms. Such variability may give random measurement errors where some of the instrumental measurements are found to be imprecise. It is a statistical way of describing how the terms are spread out in different data sets. The more sets of values, the more scattered data is found, and it is always directly proportional. This range of values can vary from 5 - 10 values to 1000 - 10,000 values. This spread of data is described by the range of descriptive range of statistics. The dispersion in statistics can be represented using a Dot Plot, Box Plot, and other different ways. 
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Measures of Dispersion: All You Need to Know

What is Dispersion in StatisticsDispersion in stat... Read More