Hi,

i'm trying to apply StepAIC with coxph...but i have the same error:

stepAIC(fitBMT)
Start:  AIC=327.77
Surv(TEMPO,morto==1) ˜ VOD + SESSO + ETA + ........

Error in dropterm.default(fit,scope$drop, scale=scale,trace=max(0,  :
number of rows in use has changed: remove missing values?

anybody know this error??

Thanks.

Michele

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