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1. Categorical Variables¹²A categorical variable is a type of variable that can take on one of a limited, and usually fixed, number of possible values, assigning each individual or other unit of observation to a particular group or nominal category based on some qualitative property. These variables are also known as qualitative variables and are used to represent data that can be divided into distinct groups or categories.Types of Categorical VariablesCategorical variables can be classified into three main types:
   1. Nominal Variables: These variables define data qualities, features, and functionality without any order or ranking. Examples include gender, religion, and race.
   2. Ordinal Variables: These variables are ordered and positioned according to their value. They categorize data and align them accordingly. Examples include survey responses, income brackets, and education levels.
   3. Binary Variables: Also known as dichotomous variables, these represent categorical variables in the form of binary values (0 and 1). Examples include yes/no questions and presence/absence of a characteristic.
   Examples of Categorical Variables
   • Demographic Information: Gender, disease status.
   • Blood Type: A, B, AB, or O.
   • Political Party: Green Party, Christian Democrat, Social Democrat, etc.
   • Type of Rock: Igneous, sedimentary, or metamorphic.
   Characteristics and UsageCategorical variables are used to separate and filter data into different groups. They are not meant for calculation purposes but for collating and identifying data. For instance, a group of people categorized based on gender cannot be further measured for mean or median, but the same group can be used to denote different heights for arithmetic operations.Coding Systems for Categorical VariablesWhen including categorical variables in regression analysis, they must be converted to quantitative data using coding systems. The three main coding systems are:
   1. Dummy Coding: Used when there is a control or comparison group in mind. The reference group is assigned a value of 0, and the group of interest is assigned a value of 1.
   2. Effects Coding: Compares one group to all other groups combined. The group of interest is coded with 1, and the group of least interest is coded with -1.
   3. Contrast Coding: Allows researchers to ask specific questions by designing unique comparisons based on previous theory or research.
   ConclusionCategorical variables play a crucial role in statistical analysis by allowing data to be grouped and analyzed based on qualitative properties. They are essential in various fields such as market research, educational surveys, political science studies, and medical case studies.Learn more:1 –en.wikipedia.org2 –wallstreetmojo.comSee less02:53What is a Categorical Variable? (Easy Explanation)YouTubeSocial Science Explainer730 viewsMar 1, 2025Related concepts
   • Numerical Variable
   • Ordinal Variable
   • Binary Variable
   • Continuous Variable
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1. statslearn.orghttps://www.statslearn.org › glossary › categorical-variableWhat Is a Categorical Variable? Definition and ExampleJul 31, 2026 · A categorical variable, also called a qualitative variable, records which group each observational unit belongs to. Its …
2. Videos of What is a Categorical Variable Simple Definition2:53WhatisaCategoricalVariable? (Easy Explanation)YouTubeSocial Science Explainer730 viewsMar 1, 20254:12💯 The Categorical Variables in Statistics Explained with Fair ExamplesYouTubeiitutor.com10.7K viewsOct 21, 20182:40Identifying individuals, variables and categorical variables in a data set | Khan AcademyYouTubeKhan Academy210.3K viewsNov 28, 2017
3. Wikipediahttps://en.wikipedia.org › wiki › Categorical_variableCategorical variable – WikipediaIn computer science and some branches of mathematics, categorical variables are referred to as enumerations or enumerated types. …
4. ResearchMethod.nethttps://researchmethod.net › categorical-variableCategorical Variable: Types, Examples and How to Analyze It
   • Types of Categorical Variables
   • Analyzing Categorical Variables
   • Examples of Categorical Variables in Real Research
   • Tips For Using Categorical Variables in Research
   • Conclusion
   • References
   Categorical variables are typically divided into two main types: nominal and ordinal. Each type is used for different purposes depending on the nature of the data and the analysis required.See more on researchmethod.net
5. WallStreetMojohttps://www.wallstreetmojo.com › categorical-variableCategorical Variable – What Is It, Examples, Types – WallStreetMojoJan 13, 2026 · Categorical variables are qualitative variables that assign data in different groups or identity brackets. In statistics, …
6. EduCBAhttps://www.educba.com › categorical-variableCategorical Variable | Meaning, Types, Examples & ImportanceMay 15, 2026 · What Is a Categorical Variable? A categorical variable represents characteristics or attributes that divide data into …
7. GeeksForGeekshttps://www.geeksforgeeks.org › maths › categorical-dataCategorical Data – GeeksforGeeksJul 6, 2026 · Categorical Data is a type of qualitative data that classifies information into distinct groups or categories based on …
8. AllTheSciencehttps://www.allthescience.org › what-is-a-categorical-variable.htmWhat Is a Categorical Variable? (with picture) – AllTheScienceMay 21, 2024 · A categorical variable, which is also referred to as a nominal variable, is a type of variable that can have two or more …
9. Quickonomicshttps://quickonomics.com › terms › categorical-variableCategorical Variable Definition & Examples – QuickonomicsApr 6, 2024 · Unlike numerical variables, which express quantitative properties and can be measured, categorical variables represent …
10. Statistics How Tohttps://www.statisticshowto.com › qualitative-variableQualitative Variable (Categorical Variable): Definition and …A qualitative variable, also called a categorical variable, is a variable that isn’t numerical. It describes data …
11. Statologyhttps://www.statology.org › categorical-vs-quantitativeCategorical vs. Quantitative Variables: Definition + ExamplesSep 13, 2022 · This tutorial provides a simple explanation of the difference between categorical and quantitative variables, including …
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