topic Re: wrong Stratum from ods output SurvivalPlot= dataset from proc lifetest in Statistical Procedures

wrong Stratum from ods output SurvivalPlot= dataset from proc lifetest

Sally_Caffrey — Mon, 12 Jun 2023 15:00:35 GMT

Hi, I have a data including trt variable and resp variable, below is the unique value.

proc sql;select distinct trt, resp from data;run;

Then I use this data to create survival data by proc lifetest, but the "survival" data from the ods output has a trt group that does not exist in the data, which looks very odd...

proc lifetest data=data timelist=(0 to 12 by 1) atrisk outsurv=surviv ;  
by trt  ;
time aval*cnsr(1);
strata resp  ;
ods output SurvivalPlot=survival ProductLimitEstimates=atrisk Quartiles=Quartiles;
run;

proc sql;select distinct trt, Stratum, StratumNum from survival;run;

For trt=2, the resp changes to "PR(N=70)" instead of "PR(N=5)". It follows the trt=1...

Does anyone knows why this wrong Stratum is output ? How to fix it ?

Re: wrong Stratum from ods output SurvivalPlot= dataset from proc lifetest

Reeza — Mon, 12 Jun 2023 15:03:28 GMT

You'll need to post your actual code and log for us to help out here. 99.9% of times this is user error, for example using different dat sets as input.

Re: wrong Stratum from ods output SurvivalPlot= dataset from proc lifetest

ballardw — Mon, 12 Jun 2023 15:28:15 GMT

Show every bit of code that you ran between that Proc SQL (which would still be running for quite a while as

SQL should terminate with QUIT; instead of RUN;) and that Proc Lifetest.

On possibility is if you are in the habit of using code like the following then you may have had a logic error changing values.

data data;
   set data;
/* manipulation goes here*/
run;