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st: ranksum: p-value?


From   Vanessa Mahlberg <[email protected]>
To   [email protected]
Subject   st: ranksum: p-value?
Date   Tue, 12 Jun 2007 17:53:51 +0200

Hi,

I?ve done a Wilcoxon test for testing the difference between two groups.
Now I have a doubt about the interpretation of the result of this test.
I don?t know which one is my real p-value. The one Prob > z =   0.0216
or 0.604??? The obtained result is:

.ranksum a_firmenbewertung, by (zugeh) porder

Two-sample Wilcoxon rank-sum (Mann-Whitney) test

zugeh                   obs    rank sum    expected

Ehemalige Pr        84      7327.5        6678
Direkteinste          74      5233.5        5883

combined           158       12561       12561

unadjusted variance    82362.00
adjustment for ties    -2423.03
----------
adjusted variance      79938.97

Ho: a_firm~g(zugeh==Ehemalige Praktikanten) =
a_firm~g(zugeh==Direkteinsteiger)
z =   2.297
Prob > z =   0.0216

P{a_firm~g(zugeh==Ehemalige Praktikanten) >
a_firm~g(zugeh==Direkteinsteiger)} = 0.604

Thanks for your support
Vanessa


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