I have conducted a one-way ANOVA on 8 groups. I understand that the degrees of freedom for that test is 7, but I don't understand how to ascertain the degrees of freedom for the post hoc tests:
I conducted a series of t-tests as the multiple comparison post-hocs using the Holm-sidak method of familywise error rate reduction. How does one figure out what the degrees of freedom are for such tests? Is it simply
n1 + n1 - 2, as it would be for regular t-tests?
If so, since my samples sizes are 893 and 169 respectively for the post-hoc t-test in question, are the sample sizes getting a little high, forcing my Type I error rate up?