On Wed, Mar 20, 2013 at 10:33 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> However, it is also likely that the means are hiding important details
> in the distributions. <...>
>
> Although I have much faith that Student's t test works well even if
> you lie to it, skewness sounds like an area for investigation.
Agreed. Mean differences may not be all that important.
My gut
> instinct is that turning the problem round to make it a logit
> regression on age makes much more sense. I would use a fractional
> polynomial or cubic spline in age and always plot some smooth summary
> of one or other fraction (e.g. fraction C or fraction V) versus age.
Continuing in my spirit of "me, too!"... very good advice.
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