Hello, I have a question regarding hierarchical cox regression model. When you have two variables for clustering, for example hospital and physician, and want to do time-to-event analysis, is the following code appropriate? If not, is there any statement or procedure for this analysis? PROC PHREG data=DATANAME covs(aggregate) covm; model TIME.*EVENT(0)= Variables / rl ; id hospital Physician; ; run;
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