stratum in proc lifetest

[lmyers2]

Hello,

I'm using sas 9.4 and am trying to make a Kaplan Meier curve.  Below is my code. The error message that I get is that the variable Group is not found. However, I have the variable Group in output from a proc freq step just before running proc lifetest. It is a numeric variable 0, 1, 2 with a few missing. Why doesn't the strata step recognize my variable Group?  Does the strata variable need to be character variable or some other specification to be recognized?

ods graphics on;
proc lifetest data=data plots=survival (cb=hw atrisk(outside(0.15)));
   time survt * status(0);
   strata Group / order=internal test=logrank; 
run;
ods graphics off;

Best

Laura

[Rick_SAS · Accepted solution]

Did you merge the results of your PROC FREQ statement into the DATA data set?  To make sure the data set has the GROUP variable, run

proc contents data=data short varnum;
run;

and post the results.