Date:         Sat, 26 Jun 2004 16:07:50 -0400
Reply-To:     "Zdaniuk, Bozena" <BZdaniuk@ucsur.pitt.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "Zdaniuk, Bozena" <BZdaniuk@ucsur.pitt.edu>
Subject:      Cox regression
Content-Type: text/plain; charset="us-ascii"

Hello, I am running a Cox regression predicting the rate of death using
different covariates. I want to see if change in depression affects the
rate. I am putting in the dep score at baseline and dep score right
before death as predictors. Should I make the pre mortem depr score a
Time Dependent variable? Cox regression gives an option of designating a
variable as Time Dependent but I don't understand exactly what this
does. It seems from what I've read in the manual that it just adds a
current time to the variable. Would this then be appropriate for my
analysis? Thanks a lot.
Bozena Zdaniuk