Hi everyone,

I encountered a problem using the coxph function for the conditional 
logistic regression. I am trying to do some simulations and I really don’t 
understand a mistake which happened maybe only 1 time among more than 
1,000 simulations.

What appeared on the screen is the following:

Error in fitter(X,Y,strats,offset,init,control,weights=weights,:
NA/NaN/Inf in a foreign function (arg 6)
Warning message:
Ran out of iterations and did not converge in: 
fiiter(X,Y,strats,offset,init,control,weights=weights,

I don’t know if the warning message could have caused the error or vice 
versa.

Does anyone have just an idea of what kind of error it can be? I don’t put 
all the code because it is very long. But I guess that this error message 
may have an "answer" whatever the code is?

Thanks so much in advance!

Willy

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