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Date:         Thu, 1 Sep 2005 07:18:15 -0400
Reply-To:     "David M. Fresco" <>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "David M. Fresco" <>
Subject:      Decomposing interaction term in Cox Regression
In-Reply-To:  <>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed


I am hoping for some help in undertaking a decomposition of an interaction effect in Cox regression.

I am tracking when relapse occurs in a sample of individuals as a function of what treatment they received as well as two additional factors A, B and A*B.

The output indicates that the interaction of A*B is significant and a get a B and SE of B in the output. I am certainly familiar with solving interactions for OLS, but would welcome some suggestions on how to interpret this interaction.

Below is essentially the syntax I used.

COXREG relapse /STATUS=censored(0) /STRATA = txcond /METHOD=ENTER a /METHOD=ENTER b /method = ENTER a*b /CRITERIA=PIN(.05) POUT(.10) ITERATE(20) .

Thanks in advance and I would appreciate my email being cc'ed to responses as I take the digest.

------ David M. Fresco, Ph.D. Department of Psychology Voice: (330) 672-4049 Kent State University Fax: (330) 672-3786 226 Kent Hall Annex P.O. Box 5190 psychology/ Kent, OH 44242-0001 ~dfresco/

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