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Thread: Interaction terms with non-signficant main effects

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    Interaction terms with non-signficant main effects




    I am using a logit model to do the analysis on my dissertation data. 2 of the variables interact, so I have an interaction term. My question is 2 parts:
    1. When I run the model without the interaction term, one of the main effects is not significant. Can I still include the interaction term?
    2. If so, when I run the model with the interaction term, the interaction is significant, as is one of the main effects, but the other is not. Can I still interpret the interaction term?

    thanks,
    SK

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    Re: Interaction terms with non-signficant main effects

    Absolutely, if the interaction term is significant you forget about its main effects (though keep them in the model) - since they are conditional on the other variable. How are the two independent variables formatted (e.g., both binary)?
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    Re: Interaction terms with non-signficant main effects


    thanks, hlsmith! yes, both independent variables are binary.

    Quote Originally Posted by hlsmith View Post
    Absolutely, if the interaction term is significant you forget about its main effects (though keep them in the model) - since they are conditional on the other variable. How are the two independent variables formatted (e.g., both binary)?

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