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Re: st: generalized Wilcoxon-Mann-Whitney ranksum test Interpretation


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: generalized Wilcoxon-Mann-Whitney ranksum test Interpretation
Date   Sun, 2 Sep 2012 11:44:02 +0100

-vanelteren- (SSC) is a user-written program, as you are asked to explain.

Clearly, you need to look at your output in conjunction with
descriptive statistics (-tabstat- is often helpful here), and indeed
graphs of the data, but otherwise there seems nothing exotic here: you
have test statistics, P-values, etc. and the interpretation is like
that of any such significance test.

Nick

On Sun, Sep 2, 2012 at 11:05 AM, Caliph Omar Moumin
<sheikmoumin@yahoo.com> wrote:

> I applied vanelteren test to compare two groups(non-alcohol "0"; and alcohol consumers"1"), Th output shows only agegroup, not whether alcohol consumer or not
>
> So how do i interpretatethis output and say something about whether alcohol user has higher median or not
> Kind Regards
>
> Caliph
>
>
>
> bysort  tilstand4 gender: vanelteren  LOS, by( alcoholcons) strata( agegroup2)
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
> -> tilstand4 = A46, gender = Male
> Generalized Wilcoxon-Mann-Whitney Ranksum Test (van Elteren's Test)
>
>                                                Variance of
>                        Weighted    Expected     Weighted
>    Stratum   |   n   | Ranksum   | Ranksum  |   Ranksum
> -------------+-------+-----------+----------+-------------
>        18-39 |  360  |   174.00  |  173.0   |    1.093
>        40-59 |  653  |   299.65  |  304.0   |    3.432
>        60-79 |  616  |   250.93  |  258.0   |    6.908
> -------------+-------+-----------+----------+-------------
>     Sums     |1,629  |   724.58  |  735.0   |    11.433
> Asymptotic test statistic
> z =   -3.08
> Prob(Z > |z|) =  .0021
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
> -> tilstand4 = A46, gender = Female
> Generalized Wilcoxon-Mann-Whitney Ranksum Test (van Elteren's Test)
>
>                                                Variance of
>                        Weighted    Expected     Weighted
>    Stratum   |   n   | Ranksum   | Ranksum  |   Ranksum
> -------------+-------+-----------+----------+-------------
>        18-39 |  123  |   58.35   |   59.5   |    0.309
>        40-59 |  305  |   135.23  |  138.0   |    2.142
>        60-79 |  518  |   224.00  |  227.5   |    4.565
> -------------+-------+-----------+----------+-------------
>     Sums     |  946  |   417.58  |  425.0   |    7.016
> Asymptotic test statistic
> z =  -2.803
> Prob(Z > |z|) =  .0051
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