Displaying 2 results from an estimated 2 matches for "emanuela".
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emanuel
2004 Oct 21
1
inverse gaussian distribution of frailty variable
Hello,
I'm Emanuela, I'm implemented a survival analysis and I'm trying to use a frailty model with inverse gaussian distribution, but I'm not able to find the right code, because it seems to be only a gamma and a gaussian distribution. Is there also the inverse gaussian distribution?
Thanks a lot
Emanu...
2004 Nov 17
1
frailty and time-dependent covariate
...d the time-dependent covariate the model doesn't converge. Instead, if I estimate the same model without the time-dependent covariate it's converge. I'd like knowing if it's a statistical problem due to the model formula or if it could be a problem related to my data.
Thanks a lot
Emanuela Rossi
> fit_19_1<-coxph(Surv(DATA_INI1,DATA_FIN1,EVENT1)~ V1+V2+alt1+alt2+strata(autocorr1)+cap1+SP+SP2+SP3+SP3:log(DATA_FIN1)+D1500+D3000+D4500+frailty.gaussian(ID),data=SURV1)
Warning messages:
1: Inner loop failed to coverge for iterations 1 3 in: coxpenal.fit(X, Y, strats, offset, ini...