Add a Class Variable

After seeing the tables that we have built so far in this chapter, you are probably asking yourself, "Why use PROC TABULATE? Everything I’ve seen so far could be done with PROC MEANS."
One answer to this question is class variables. By specifying a variable to categorize your data, you can produce a concise table that shows values for various subgroups in your data. For example, it would be more interesting to look at mean income if it were broken down by the education level of the survey respondent. This is the third piece of the example table for this chapter.
To break down income by education level, we use EDUC as a class variable. Just as we used a VAR statement to identify our analysis variable, we use a CLASS statement ...

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