WEIGHT variable;
The WEIGHT statement names the variable that contains the sampling weights. This variable must be numeric, and the sampling weights must be positive numbers. If an observation has a weight that is nonpositive or missing, then PROC SURVEYIMPUTE omits that observation from the analysis. For more information, see the section Missing Values.
If you do not use a WEIGHT statement but you provide replicate weights in a REPWEIGHTS statement, PROC SURVEYIMPUTE uses the average of each observation’s replicate weights as the observation’s weight.
If you use neither a WEIGHT statement nor a REPWEIGHTS statement, PROC SURVEYIMPUTE assigns all observations a weight of 1.