Morelli Paolo <[EMAIL PROTECTED]> wrote:
: HI all,
: I have to analyse some clinical data. In particular the analysis is a
: comparison between two groups of the mean change baseline to endpoint of a
: score.
i hope that your study is randomized; if not it's not worth worrying
about. If so his analysis is equivalent to ANCOVA on post covarying pre
and is the only proper analysis. The true measure of change is a
comparison between the two groups since the proper question is how does
the experimental group compare to what it would have been without the
experimental condition. Ancova simply increases power here
you should test for parallelism
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