Esoteric stats question.
SPSS/PASW v. 18 if it matters, although I think this has been a feature for awhile.
If you are running a between-subjects design, then you may select from about 18 post-hoc tests to run if you find significance. However, if you want to run a repeated measures (within subjects) design, you will find that that whole section is grayed out with no explanation.
If you go to Options > Display means for FactorX, then you can do “confidence interval adjustments.” There are only three choices here, “LSD (none),” “Bonferroni,” and “Sidak.” Googling suggested these are also post-hoc tests, even if not labeled as such.
Are these three in fact post-hoc tests, usable in the same manner?
Why doesn’t SPSS let you use the rest of them with repeated design? Are they not appropriate with repeated measures, or is the program just being difficult?