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st: RE: ranksum

From   "Nick Cox" <>
To   <>
Subject   st: RE: ranksum
Date   Tue, 13 Feb 2007 09:52:36 -0000

You report a difficulty with -ranksum- but do not 
say what it is.  

-livbirth- is numeric. 

-randgrp- should contain two (and only two) 
distinct categories. If this is not true, then 
it is likely to be the root of any problem. 
This follows from the essence of the test, and 
is not a Stata issue. 


What did you expect?

What did Stata do or say? 

If not obvious otherwise, why this is a difficulty? 


P chrisman
> I am having difficulty using ranksum. The code I used is ranksum 
> livbirth, by(randgrp). I also tried
> destring numpreg livbirth, generate(numpreg2 livbirth2)
> numpreg already numeric; no generate
> livbirth already numeric; no generate
> . destring randgrp, generate(randgrp2)
> randgrp contains non-numeric characters; no generate
> Perhaps the solution to my problem is apparent, but I am not skilled 
> enough with Stata to see it. Any help is appreciated.

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