Posted by
Maguin, Eugene on
Dec 15, 2016; 2:56pm
URL: http://spssx-discussion.165.s1.nabble.com/Interactions-binary-logistic-regression-tp5733602p5733603.html
I'm confused by what you are doing--or, maybe, it's just your description. So let's say you are using the logistic regression command and your syntax is something like this (I assume iv1 iv2 iv3 are all dichotomous and coded 0,1):
Logistic regression variables=dv with iv1 iv2 iv3 iv1 by iv2 iv1 by iv3 iv2 by iv3 iv1 by iv2 by iv3/enter iv1 iv2 iv3/
Enter iv1 by iv2 iv1 by iv3 iv2 by iv3/enter iv1 by iv2 by iv3.
I suggest you look at the GenLin command. It sounds like you are interested in planned comparisons. GenLin will give those to you if you specify the EMMeans command. The genlin syntax is very different and, frankly, confusing until you have some experience with it. Unfortunately, no examples that you can copy are given.
Gene Maguin
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Sent: Thursday, December 15, 2016 8:30 AM
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Subject: Interactions binary logistic regression
I have data with both between- and within-subjects Independent Variables (IV) and a multiple binary Dependent Variable (DV).
In order to determine the extent to which the IV influenced the DV, I performed a hierarchical binary logical regression with main effects as step 1, two-way interactions as step 2 and the three way interaction as step 3.
However, as my results revealed significant interactions, I want to compare specific proportions of my DV according to some IV (as planned t-test after a significant ANOVA). I found that some authors used chi-squares to do that but I know that chi-squares are not suitable for within-subjects design.
Is there a specific analysis ? If no, is it possible to split my regression according to some IV?
Thank you in advance for your help!
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