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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).
We cannot order Social Security numbers in any meaningful way. Some people have Social Security numbers that start with a higher number than others but there is no meaningful difference signified by this. So the Social Security number is a nominal level variable. Any time that you arbitrarily assign a person or another entity an identification number, the resulting variable will be nominal because the numbers d4o not signify anything important or meaningful. On the other hand, interval level variables are ordered.