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When working with categorical variables, you must examine your data for unusual trends, patterns, or errors. A Frequency table will allow you to see these trends, patterns or errors. Kent State's SAS guide outlines Frequency tables in SAS, including examples.
Frequency Tables using PROC FREQ
Boston University's School of Public Health has a One Sample Test of Proportions in SAS example page.
Ed Boone, a professor at Virginia Commonwealth University, created a video on Two Sample Test on Proportions.
