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Thread: Repeated measures 2x3 design on SPSS

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    Repeated measures 2x3 design on SPSS




    My data has two factors. Factor 1 has 2 levels and Factor 2 has 3 levels.

    ie a 2x3 design. Right? The study is within-subjects.

    So on SPSS, I went to General Linear Model -> Repeated Measures and entered factor 1 (2) and factor 2 (3). But then when I go to define it, SPSS gives me:
    1,1
    1,2
    1,3
    2,1
    2,2
    2,3

    Well I don't have a 1,3. (this emoji portrays my exact state)


    I'm probably not even using the right statistic. I don't understand what the 1,3 is supposed to be when I entered in that factor 1 only has 2 things.

    Can anyone help me?
    Thanks

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    Re: Repeated measures 2x3 design on SPSS

    This would have better been posted to the SPSS-subforum. But anyway.

    If this is a purely within-subject (repeated measures)-design, then you have 6 measurements for each participant. In SPSS, you should have 6 columns then.

    Each measurement (column) belongs to a certain combination of factor A and factor B.

    E.g. 1,3 is the column which contains the measurements taken on level 1 of factor A in combination with level 3 of factor B.

    With kind regards

    Karabiner
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    Re: Repeated measures 2x3 design on SPSS

    Thank you karabiner.

    I see what you mean and my design is not a normal one I guess (or maybe it is but it hasn't a different name idk).

    I have (using letters as the second one to distinguish them):
    1,A
    1,B
    2,A
    2,B
    2,C

    There is no 1,C. The teacher designed it and calls it a 2x3, but the C only happens once. There are only 5 columns of data. I would say it's still within-subjects because everyone did all of these.

    I'm thinking maybe I want to compare A vs B vs C?
    So that would be:
    A,1
    A,2
    B,1
    B,2
    C
    But that's not how the teacher set it up on the sheet and that doesn't really help with the C, does it?

    Do you know what test I would need to do for this or what this is?

    Thanks again

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    Re: Repeated measures 2x3 design on SPSS


    The simplest way would be to treat this as a single factor with 5 levels, and perform pairwise post-hoc comparions between levels, if the repeated-measures ANOVA gives a statistically significant omnibus test.

    With kind regards

    Karabiner
    »Jetzt kann mich der Führer mal am Arsch lecken.« (Ernst Kuzorra, 1941)

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