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st: RE: Ranksum and Makematrix


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Ranksum and Makematrix
Date   Fri, 1 Apr 2005 20:06:04 +0100

As always, please remember for the edification
of others to quote the origin of Stata 
commands that are user-written. 

-makematrix- is available from SSC. 

Without knowing more about your data, this 
does appear strange. It may be that you 
need to apply the -listwise- option. 

With P-values as small as that, you don't
need these results anyway! 

Nick 
n.j.cox@durham.ac.uk 

Herve STOLOWY
 
> I face the following strange phenomenon concerning the 
> -ranksum- test and -makematrix-.
> 
> If I use the following command:
> 
> makematrix c1, from(r(z) 2*normprob(-abs(r(z)))) : ranksum 
> exp_fi , by(interne)
> 
> It works and I get the following matrix:
> 
> c1[1,2]
>                           z  2*normprob(-abs(z))
> exp_fi            4.9154637            8.857e-07
> 
> When I add two variables, my first variable is not disclosed anymore:
> 
> makematrix c2, from(r(z) 2*normprob(-abs(r(z)))) : ranksum 
> exp_fi fonction_ent fonction_exp, by(interne)
> 
> c2[3,2]
>                                 z  2*normprob(-abs(z))
>       exp_fi                    .                    .
> fonction_ent           -5.8967476            3.707e-09
> fonction_exp            5.8967476            3.707e-09
> 
> I know that the last two variables are defined on the basis 
> of the first one. But is this explanation sufficient to 
> understand why the first variable "disappears"? Why couldn't 
> I have the first variable also reported, as it is with the 
> first command?

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