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Re: st: generalized Wilcoxon-Mann-Whitney ranksum test Interpretation
From
Nick Cox <[email protected]>
To
[email protected]
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
<[email protected]> 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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