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mic1
2011 Aug 21
3
pooled hazard model with aftreg and time-dependent variables
...ariable representing
individuals, as a factor, and a variable for each sample, and included them
in the model. I provide an example below.
If I include the factor sample the analysis works. If I include both sample
+ individual like this:
>> weibullaft<-aftreg(Surv(sta,time,S) ~ TDC1 + TIC1 + sample + individual,
>> dist="weibull",
>> data.frame=Data, id=ID)
, it appears an error with aftreg saying:
Error in solve.default(fit$hessian) :
Lapack routine dgesv: system is exactly singular
With phreg the error is:
fail in [dsytrf]; info = 14
1 - I am prob...