I'm fairly new to SAS, using LIFETEST with the TEST statement, looking at association between covariates and survival time. I've noticed that if I run PROC LIFETEST several times, testing only a single variable each time (say 'age', then 'sex', then 'weight') I get a different set of results than if I use multiple variables within a single PROC LIFETEST (TEST age sex weight;). I am talking about results for only "Univariate Chi-Squares for the Log-Rank Test".
The results are similar, but not the same - I was under the impression that by using multiple variables in the TEST statement it would simply run a univariate test for each variable in turn, but the differing results suggest otherwise.
Any advice would be greatly appreciated!
Thanks.
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