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st: mann-whitney test


From   ottone@unipmn.it
To   statalist@hsphsun2.harvard.edu
Subject   st: mann-whitney test
Date   Thu, 4 May 2006 17:05:29 +0200 (CEST)

Sorry, but I'm confused! I ran two treatments and  32 subjects (organised
in group of 4) participated to each treatment (10 periods). This means
that I have only 8 independent observations in each period for each
treatment. How should be my dataset to run the mann-whitney test? If I
consider 320 observations in each treatment, I cannot say that they are
independent. How should I perform the test in this case?

stefania ottone



> 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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