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From |
"Andreas Aschbacher" <aa_surf@gmx.at> |

To |
statalist@hsphsun2.harvard.edu |

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 > > . findfile ranksum.ado > . 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 > n.j.cox@durham.ac.uk > > 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 > > > > unadjusted variance 8.636e+15 > > adjustment for ties -1.316e+08 > > ---------- > > adjusted variance 8.636e+15 > > > > 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| ? > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- GMX ProMail (250 MB Mailbox, 50 FreeSMS, Virenschutz, 2,99 EUR/Monat...) jetzt 3 Monate GRATIS + 3x DER SPIEGEL +++ http://www.gmx.net/derspiegel +++ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: RE: Wilcoxon-ranksum-test***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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