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st: stcox: phtest with shared frailty
The Methods and Formulas documentation for for -estat phtest- describes in
detail how -stcox- shared frailty models are handled, but this doesn't seem to
. stcox myvar, schoenfeld(var1) shared(frailvar)
. estat phtest
invalid subcommand phtest
However, it works fine for the same model if frailty is not specified.
I found this identical problem posted a few months ago, but no responses.
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