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    Question 2x2 Repeated Measures ANOVA




    Dear all,

    I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an intervention. These were performed by the same subjects.

    When I run the test (General Linear Model > Repeated Measures), there is no data for Mauchly's Test of Sphericity. As a result, I do not know if my data is spherical and can therefore not proceed.

    Any help would be greatly received,

    Many thanks........ Pedro

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    Re: 2x2 Repeated Measures ANOVA

    Can't you just compare the difference of pre and post intervention using a t-test?

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    Re: 2x2 Repeated Measures ANOVA

    I had contemplated that, although it would be good to look at an interaction to ensure the pre values are not significantly different over the two days. I also didn't know if such a method would cause a violation of some form?

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    Re: 2x2 Repeated Measures ANOVA

    You never stated in your first post what program you were using. I also may consider examining the differences option, you can use the t-test or put it into an general linear model and make it a two-way if you want to examine something else as well. Though, from your short description it is hard to make a recommendation.

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    Re: 2x2 Repeated Measures ANOVA


    Apologies, I am using IBM SPSS Statistics 20.

    Hopefully some clarity.... My dependant variable is muscle reaction time to an ankle perturbation taken pre and post intervention. My independent variable is intervention (ice application or sham). Whilst the differences may be an option, it is important that there is no significance between the pre intervention reaction times, which the t-test difference option would not perform.

    Thanks.... Pedro

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