Hi,  
  
If you want to impute the missing values with mean or median or 0 or with any stats, you have to use Proc STDIZE procedure.The below is the example   
  
proc stdize data=abc method=median reponly;  
run;  
  
For missing values if we want to impute with zeroes then the example would be   
  
proc stdize data=abc missing=0 reponly;  
run;  
  
Kindly let me know if this useful or not.
						
					
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