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Math Help - stats-problem with doing mulitple t-tests for mulitple comparisons of data...

  1. #1
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    stats-problem with doing mulitple t-tests for mulitple comparisons of data...

    as opposed to using one-way anova?

    please correct me if i'm wrong, but isn't the major problem with performing multiple 2-sample t-test for say 3 sets of data that the type I error is much larger than anticipated...?

    thanks.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by beetz View Post
    as opposed to using one-way anova?

    please correct me if i'm wrong, but isn't the major problem with performing multiple 2-sample t-test for say 3 sets of data that the type I error is much larger than anticipated...?

    thanks.
    With three samples you have 3 pairwise tests, the problem is that they are
    not independent tests, and so even raising the thresholds for acceptance
    rejection does not give you what you want without a lot of work on the
    correction for the correlations.

    RonL
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