We can use the CASE statement in SAS to create a new variable that uses case-when logic to determine the values to assign to the new variable.
This statement uses the following basic syntax:
proc sql; select var1, case when var2 = 'A' then 'North' when var2 = 'B' then 'South' when var2 = 'C' then 'East' else 'West' end as variable_name from my_data; quit;
The following example shows how to use the CASE statement in practice.
Example: Using the CASE Statement in SAS
Suppose we have the following dataset in SAS:
/*create dataset*/ data original_data; input team $ points rebounds; datalines; A 25 8 A 18 12 A 22 6 B 24 11 B 27 14 C 33 19 C 31 20 D 30 17 D 18 22 ; run; /*view dataset*/ proc print data=original_data;
We can use the following CASE statement to create a new variable called Division whose values are based on the values of the team variable:
/*create dataset*/ proc sql; select team, points, case when team = 'A' then 'North' when team = 'B' then 'South' when team = 'C' then 'East' else 'West' end as Division from original_data; quit;
Note that a new variable Division was created whose values are based on the values for the team variable.
The following tutorials explain how to perform other common tasks in SAS: