af2a44c6_l__Variance_Estimation__Task_3_SUDAAN_proc_descript_procedure_Explanation
[Statements] Weight wtmec4yr; [Explanation] 
Use the weight statement to account for the unequal probability of sampling and nonresponse. In this example, the MEC weight for four years of data is used.
Continuous NHANES Web Tutorial: Variance Estimation: Task 3
Explanation