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Help with ANOVA with Repeated Measures for Non-Normal data

  • 1.  Help with ANOVA with Repeated Measures for Non-Normal data

    Posted Mon November 08, 2021 10:04 AM
    Hello,

    I need help comparing the means of a small dataset. The dataset looks like this (mock data):

    Name  Baseline  1_month 2_months
    P001 81.22 100 N/A
    P002 56.23 75 68.68
    P003 40 40 N/A
    P004 100 N/A 100
    P005 40 N/A N/A
    P006 73.33 40 N/A
    P007 0 39.36 18.69
    P008 94.44 90.55 85.55
    P009 15.56 N/A N/A
    P010 83.26 N/A N/A

    The data is not normally distributed, and I tried transforming it with Log10, but still, it wasnt normal. There is a fair bit of missing data points, and the actual dataset is small, about 40 individuals.  I need to compare the means of these values, between the different time frames, just so that I can say if there are no significant differences between the mean responses at baseline vs 1 and vs 2 months...

    Can I just do an ANOVA with Repeated Measures, despite the data not being normally distributed? Somewhere I read the test is robust to failing this assumption. Or is there another more appropiate test or procedure?

    Thank you for any feedback,


    Freddy

    ------------------------------
    KARL GRUBER
    ------------------------------

    #SPSSStatistics


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