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st: RE: mann-whitney test


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: mann-whitney test
Date   Thu, 4 May 2006 15:26:49 +0100

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. 

Nick 
n.j.cox@durham.ac.uk 

ottone@unipmn.it

> 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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