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X! cannot be a confounder of Y, X1 might confound the relation of X2 and Y but a confounding variable is one whose effect on the outcome cannot be separated from that of another variable.
Paul R. Swank, Ph.D.
Professor, Department of Pediatrics
Medical School
Adjunct Professor, Health Promotions and Behavioral Sciences
School of Public Health
University of Texas Health Science Center at Houston
From: A UK-based worldwide e-mail broadcast system mailing list [mailto:[log in to unmask]] On Behalf Of Jim Silverton
Sent: Wednesday, August 29, 2012 8:39 AM
To: [log in to unmask]
Subject: Re: Confounders and logistic regression
Hi,
I have a question. Suppose I have 4 variables Y, X1, X2 and X3. They are all categorical.
How do I determine if X1 is a confounder of Y?
Secondly, if I want to do a logistic regression and X1 is a confounder of Y, how do I carry outa logistic regression say.
--
Thanks,
Jim.
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