[R] stepAIC

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From: array chip (arrayprofile@yahoo.com)
Date: Wed 21 May 2003 - 06:44:11 EST


Message-id: <20030520204411.50253.qmail@web41201.mail.yahoo.com>

Hi,

I tried to use stepAIC for a cox proportional model
(30 independent variables) built by coxph. I found
that no matter whether I used direction="forward" or
direction="backward" as an option in stepAIC, I
alweays got exactly the same output, i.e. it seems
only backward selection was performed (eliminate 1
variable at a time). why did it happen like this? or
for cox model, stepAIC can only perform backward
selection?

thanks

zander

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