To R-project help
I work with a clinical dataset including about 27,000 patients and I wanted to
do some model diagnostics on cox regression models with frailty effects (for
every patient). But in this case the cox.zph function did not work. I always
got the following error message:
Fehler in residuals.coxph(fit, "schoenfeld") :
NA/NaN/Inf in externem Funktionsaufruf (arg 5)
Does anyone know what's wrong? I did the same without using frailty effects and
everything was o.k. What could I do?
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