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st: generalized Wilcoxon-Mann-Whitney ranksum test Interpretation


From   Caliph Omar Moumin <sheikmoumin@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: generalized Wilcoxon-Mann-Whitney ranksum test Interpretation
Date   Sun, 2 Sep 2012 03:05:29 -0700 (PDT)


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


Email:  sheikmoumin@yahoo.com 

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