06-15-2015 11:16 AM
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;
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!