Dear members of Allstat,
I am currently working on a study which includes 3 treatment arms (equal n)
and for which three pairwise comparisons are planned. I looked at the stats
section of the protocol and noticed that there are two adjustments for
multiple comparisons: Bonferonni correction in the sample size calulation
and Tukeys method in the analysis.
I have two questions:
Do you think that the adjustment at sample size calculation was neccessary
if the Tukey method will be used in the analysis?
Does anyone know of a formula for estimating the sample size using Tukeys
method?
Kind regards,
Des
|