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Thread: Interaction between categorical and scale variables?

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    Question Interaction between categorical and scale variables?




    Hi, I'm supposed to conduct a regression analysis between two variables, controlling for a third. My issue is that all of the output I'm getting in SPSS treats my categorical variable as a score rather than splitting the results.

    To be clearer, the interaction I'm trying to measure is participant group (0, 1, 2) x Score (score variable), when adjusting for ethnicity (0, 1, 2). I've created dummy groups for ethnicity.

    What I need my output to look like (making up results) is something like:

    Group 0: 12
    Group 1: 21
    Group 2: 22
    (when adjusted for ethnicity)

    but I'm really not the best at statistics and I'm having a hard time achieving this. Would anyone here be able to help?

  2. #2
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    Re: Interaction between categorical and scale variables?

    You could simply perform a two-factorial analysis of variance
    with group and ethicity as factors. If you do not want to consider
    the interaction between factors, then you could build a model in
    SPSS which only contains main effects (see "model" button).
    Adjusted means for group can be requested using "options"
    in the univariate ANOVA window.

    With kind regards

    K.

  3. #3
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    Re: Interaction between categorical and scale variables?


    Hi Karabiner, thank you for your reply. I'm sorry if this is a ridiculously stupid question, but with the results of the ANOVA I'm not seeing the beta value or t statistics. Am I just missing a checkbox?

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