P-value from Proc life test

aboli — Mon, 23 Dec 2024 11:55:38 GMT

Hi ,

Does proc life test, give the correct p-value if data does not have an event for one of the strata group?

I am getting a below warning message as well as my data zero event in one treatment group.

The likelihood ratio test for strata homogeneity is questionable since some strata have no events.

   ods output censoredsummary=a1 productlimitestimates=a3 Quartiles=a4 HomTests=a5;
    proc lifetest data=ind timelist=1 to 6 by 1 outsurv=outsurv reduceout alpha=0.05 method=km conftype=loglog;
        time aval*cnsr(1);
        strata trtpn;
    run;

Re: P-value from Proc life test

sbxkoenk — Mon, 23 Dec 2024 14:17:09 GMT

Try this Google search ...

"The likelihood ratio test for strata homogeneity is questionable since some strata have no events." site:communities.sas.com

(don't forget the quotes)

BR, Koen

topic P-value from Proc life test in Statistical Procedures

P-value from Proc life test

Re: P-value from Proc life test