The mean() function in SAS already ignores missing values by default, so it should only consider non-missing values. If you're still encountering issues, double-check if your missing values are properly represented as . (for numeric data). You don’t need to modify the mean() function; it automatically excludes missing values. Here’s the correct usage:      mean(of var1 var2 ...);   To check for missing values, use:     proc means data=yourdata nmiss;     var var1 var2 ...;     run; ... View more