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Thread: Moderated Regression Non-Signficant but Subgroup Correlation Significant??

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    Moderated Regression Non-Signficant but Subgroup Correlation Significant??




    Hi Guys,
    I'm having a bit of trouble trying to figure out some of my statistics and wonder if any one has some ideas for me?
    I've run a moderated regression analysis as I've read in many places that it is the best way to approach moderation, but it was not significant. I then divided my moderator variable into 3 groups (low, medium and high scorers, n = 35 for each group) and found that there was a significant correlation between my IV and DV in the high scorers of my moderator variable.
    My concerns are:
    1. Is my significant finding meaningful at all in light of the many criticisms against split-median type methods?
    2. Why does this significant result not show up in my regression? Would it possibly be due to a step-function of my moderator?

    Thanks very much! Any thoughts appreciated!

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    Re: Moderated Regression Non-Signficant but Subgroup Correlation Significant??

    Please describe the correlation coefficients
    and p-values from the 3 groups. Please
    describe the p-value for the moderator test.

    With kind regards

    K.

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    Re: Moderated Regression Non-Signficant but Subgroup Correlation Significant??

    Hi Karabiner,
    The p value for the moderated recession analysis is .944. In the high scorers of the moderator group: r=.404 P= 0.01; medium scorers: r = -.2 p= .125; low scorers r= .007 p= .484.

    Is this problem perhaps due to normality violations? I have read that correlation is relatively robust to normality violations, but not sure about regression. Should I try a log formation?

    thanks very much!

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    Re: Moderated Regression Non-Signficant but Subgroup Correlation Significant??


    I have the same issue (i.e. non significant overall result for moderation but significant results at certain levels of the moderator). Can I ask what you ended up doing when reporting your results?

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