Programming the statistical procedures from SAS

proc lifetest

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proc lifetest


I am trying to run proc lifetest to see the median time to event and have a question about adding covariates like age, gender, race. I think the TEST statement is for continuous variables, but not sure where to put dummy variables like gender and categorical variables like race.

proc lifetest data=mydata;

     strata medgroup;

     time timeM*surgery(0);

     test age;


The other question is about the analysis result. Since only 10% of study sample have event (surgery), there is no result shown 25%, 50%(median), 75% of time to event. I plan to see median time to event, but now did not get anything. I am not sure how to solve this problem or it is just my data limitation.

Could you give me some hints about the above two questions? Thanks so much!

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