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The distinction between discrete and continuous variables is important. Categorical variables. The values of a categorical variable are selected from a small group of categories. Examples are gender (male or female) and marital status (never married, married, divorced or widowed).Categorical variables can be further categorised into ordinal and nominal variables. ... Name is a label variable. 2  Sex, Marital Status and Smoking are nominal categorical variables. 3  Age and Income are continuous numerical variables. 4  Number of children is a discrete numerical variable (a count).
Key Difference: Cardinal is used to count or indicate how many. Ordinal numbers are words that represent rank and order in a set. Nominal numbers are basically number that are used to identify something. The terms cardinal, ordinal and nominal are common terms that are used in statistics or general mathematics. The terms are used to classify numbers in a category to make it easier for use. These are often confusing for many people, but once understood it is quite simple in order to understand.