af2a44c6_l__Variance_Estimation__Task_3_SUDAAN_proc_descript_procedure_Explanation
[Statements] Rformat race racef. ; Rformat educ educf. ; [Explanation] 
Use an rformat option to specify formats for the levels of each categorical variable in the tables statement as needed. Format statements for each variable must be listed individually. In this example, you are setting the formats for the race/ethnic group (race) and education level (educ) variables.
Continuous NHANES Web Tutorial: Variance Estimation: Task 3
Explanation