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Thread: How should I run an interaction test to find out the main effect of ad type?

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    How should I run an interaction test to find out the main effect of ad type?




    Hello everyone,

    I designed an experiment. There are two types of advertisement, type 1 and type 2. 50% of my participants looked at the type 1 and told me how confusing this ad is (variable confuse1);
    the other 50% looked at the type 2 and told me how confusing this second ad is(variable confuse2).

    After one week, I asked them to tell me again how confusing this ad are.

    So I run an repeated measures analysis in SPSS and choose "ad type" as the between subjects factor :

    GLM confuse1 confuse2 BY adtype
    /WSFACTOR=time 2 Polynomial
    /MEASURE=confusedad
    /METHOD=SSTYPE(3)
    /PLOT=PROFILE(time by adtype)
    /EMMEANS=TABLES(time) COMPARE ADJ(BONFERRONI)
    /PRINT=DESCRIPTIVE ETASQ
    /CRITERIA=ALPHA(.05)
    /WSDESIGN=time
    /DESIGN=adtype.


    The output tells me that:

    1. "time" has a significant main effect of "confuse"
    2. there is no significant interaction between "time" and "ad type"

    But there no information about the main effect of "ad type".


    My question is:

    How should I figure out whether "ad type" has a main effect of "confuse" of not?

  2. #2
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    Re: How should I run an interaction test to find out the main effect of ad type?


    any ideas?

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