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List:       sas-l
Subject:    Re: Odds ratio table for cumulative logit model
From:       "Gravelle, Tim" <Tim_Gravelle () GALLUP ! COM>
Date:       2011-05-30 13:25:26
Message-ID: 64C85429AE96F945BCA136EAC7588324FF4742C3 () exchng7 ! noam ! gallup ! com
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I would suggest that interaction effects require special (or at least especially \
careful) interpretation in all models, linear, logit or otherwise.  :)  I can \
recommend the following sources covering the specification, interpretation and \
display of interaction effects (including their use in logit models):

Braumoeller, Bear F. (2004) "Hypothesis Testing and Multiplicative Interaction \
Terms." International Organization 58(4): 807-820.

Fox, John and Robert Andersen (2006) "Effect Displays for Multinomial and \
Proportional-Odds Logit Models." Sociological Methodology 36: 225-256.

Jaccard, James (2001) Interaction Effects in Logistic Regression. Thousand Oaks, CA: \
Sage.

Tim


-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of \
                polyphonic48@gmail.com
Sent: Sunday, May 29, 2011 3:18 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Odds ratio table for cumulative logit model

I have run a cumulative logit model using proc logit and have found that the odds \
ratios for two (continuous) variables used in an interaction, and the ratio for the \
interaction itself, did not print.  I recall reading somewhere that interactions \
require special interpretation in logit models but the texts on my shelf do not cover \
interactions.

Any advice, recommended reading, etc. would be appreciated!  Thanks.

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