Great question. I can't really speak to the statistical aspect--I'm

suspicious it would be violating an assumption regarding structure in the

data. I can tell you that in a business setting logistic regression is

sometimes applied to a grouping variable (like customer segments). The way

we do this is build a separate model for each segment. This is done when we

have prior knowledge that suggests different groups will respond

differently.

Jason

-----Original Message-----

From: SPSSX(r) Discussion [mailto:

[hidden email]] On Behalf Of

Brandon Long

Sent: Tuesday, August 08, 2006 3:35 PM

To:

[hidden email]
Subject: Statistical Question

This listserv is a great resource, so I was hoping someone might be able

to help me get some clarification on a certain statistical question. If

you have risk-adjusted a sample of data by certain factors using

logistic regression, is it incorrect to further stratify these results

by some sort of grouping variable? I do not believe it would be

statistically correct but am having a hard time justifying this. Am I

wrong? Any information would be helpful.

Thank you!