Use a period to check for standard missing values. if age = . then flag = "Missing"; Use code with caution. Copied to clipboard
Note: To capture special missing values (like .A through .Z or ._ ), use if variable_name <= .z . Check For Null Values In Sas
total_miss = cmiss(of _all_); /* Checks every variable in the row */ Use code with caution. Copied to clipboard Use a period to check for standard missing values
If you need to count how many fields are missing across a row, use these specialized functions: Check For Null Values In Sas
If you want to audit an entire dataset rather than filtering row-by-row, use PROC FREQ or PROC MEANS. Missing Values in SAS - ListenData