# Re: st: RE: Wilcoxon-ranksum-test

 From "Andreas Aschbacher" <[email protected]> To [email protected] Subject Re: st: RE: Wilcoxon-ranksum-test Date Fri, 20 Feb 2004 12:58:27 +0100 (MET)

```Thank you very much !!!!!!!!!!!now I have understood   andreas

Often it is easier to understand
> precisely what is going on by
> looking at the code. In your case
>
> . doedit `r(fn)'
>
> shows that Prob > |Z| is,
> in Stata language and in this case,
>
> 2 * normprob(-0.354)
>
> or
>
> 2 * (1 - normprob(0.354))
>
> In other words, it is a P-value
> calculated on the assumption that
> under the null hypothesis
> the sampling <a
href="http://www.ntsearch.com/search.php?q=distribution&v=55";>distribution</a> of z is Gaussian
> with mean 0 and variance 1. Note that
> sign is disregarded.
>
> With -ranksum- I always like to see the
> results of the -porder- option, which has
> a substantive interpretation.
>
> Nick
> [email protected]
>
> Andreas Aschbacher
>
> > I made two sample Wilcoxon-ranksum-test
> > / to show that two independent samples are from same
> > <a
href="http://www.ntsearch.com/search.php?q=distribution&v=55";>distribution</a> = H0/
> > with following results: m ... men     W ... woman
> > -
> >     gender |      obs    rank sum    expected
> > -------------+---------------------------------
> >           m |   3.7e+05  1.397e+11   1.398e+11
> >           W |   3.7e+05  1.382e+11   1.382e+11
> > -------------+---------------------------------
> >     combined |   7.5e+05  2.780e+11   2.780e+11
> >
> > adjustment for ties  -1.316e+08
> >                      ----------
> >
> > Ho: dosis(gender==m) = dosis(gender==W)
> >              z =  -0.354
> >     Prob > |z| =   0.7236
> >
> >
> >  -
> >
> > because of theorie in my <a
href="http://www.ntsearch.com/search.php?q=books&v=55";>books</a> and referencebook in Stata is not
> > "exactly the same" I want to assure about denotation of results ?
> > z= -0.354 is check-value   - o.k.
> > but I don't understand : Prob > |z| =   0.7236
> > Confidence-intervall that H0 is right - is ~72%  ??
> > but what does mean : Prob > |z| ?
>
> *
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>

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```