

ID   variables   ; 
            
The ID statement specifies one or more variables to include in the table of extreme observations. The corresponding values
            of the ID variables appear beside the 
 largest and 
 smallest observations, where 
 is the value of NEXTROBS= option. See  Example 4.3. 
         
You can also include ID variables in the output data set created by an OUTPUT statement by specifying the IDOUT option in the PROC UNIVARIATE statement.