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,
Maarten
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of [email protected]
Sent: maandag 6 juni 2005 11:16
To: [email protected]
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
Manuela De Allegri
University of Heidelberg
Germany
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