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st: RE: mann-whitney test
There is some misunderstanding here, I guess.
Mann-Whitney requires at a minimum all
the individual ranks. It can't work on just
input of averages, or even medians.
> I have to run the mann-whitney test to check the difference
> in the trend
> between two treatments in a public good game experiment.
> This test has to be run on average contributions of groups.
> Does it mean
> that I should have in my dataset a single observation for
> each group that
> represents the average contribution of the group over all the periods?
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