When you check for ordinary missing numeric VALUES, you can USE code that is similar to the following: 

if numvar=. then do;

If your DATA contains SPECIAL missing values, you can check for either an ordinary or special missing value with a STATEMENT that is similar to the following: 

if numvar<=.z then do;

To check for a missing character value, you can use a statement that is similar to the following: 

if charvar=' ' then do;

The MISSING function enables you to check for either a character or numeric missing value, as in: 

if missing(var) then do;

When you check for ordinary missing numeric values, you can use code that is similar to the following: 

if numvar=. then do;

If your data contains special missing values, you can check for either an ordinary or special missing value with a statement that is similar to the following: 

if numvar<=.z then do;

To check for a missing character value, you can use a statement that is similar to the following: 

if charvar=' ' then do;

The MISSING function enables you to check for either a character or numeric missing value, as in: 

if missing(var) then do;