Exact RISKDIFF in proc freq

[Jagadishkatam]

when i run the below code i get the

WARNING: Computing exact confidence limits for this problem may require much time and memory. Press the system interrupt key to  terminate exact computations.

could you please suggest how to overcome this warning.

        proc freq data=example ;
               tables trt*cat/ riskdiff nocol norow nopct  ;
               exact riskdiff (method=score);
        run; 

[Rick_SAS]

The warning appears to let you know that exact tests can be time consuming for large tables.  Instead of an exact test, you can use a Monte Carlo approximation to the exact test by using the MC option. For an example and discussion, see the article "Monte Carlo simulation for contingency tables in SAS."