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st: RE: test for trend

From   "Maarten Buis" <>
To   <>
Subject   st: RE: test for trend
Date   Mon, 6 Jun 2005 11:49:05 +0200

One way to test for a trend would be to add a time variable and an interaction-term between income and time. A (significant) positive parameter for the interaction-term indicates an increasing trend in the effect of income. Note that by doing so you assume a specific functional form for the trend: there is a linear relation between the effect of income on the log odds of your outcome variable and time.

Hope this helps,

-----Original Message-----
From: []On Behalf Of
Sent: maandag 6 juni 2005 11:16
Subject: st: test for trend

Dear all,

Can anyone tell me how I can do a test for trend for an adjusted odds ratio
estimate derived from a logistic regression? I am interested in exploring
whether there is an increasing effect on income on my outcome variable after I
control for all other variables in the model.

Thanks in advance.

Manuela De Allegri
University of Heidelberg

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