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st: RE: strange results with corr


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: strange results with corr
Date   Thu, 17 Feb 2005 15:58:32 -0000

You evidently have two dummies here, both 0 or 1. 

You give two of the four possible 
counts, from which we can infer that 
in 14316 - 2458 cases the values are 1 0 or 0 0. 

That seems entirely consistent with the correlation 
you get. The entire 2 by 2 table from -tab wifeprim
wifelit- is the context for the correlation. 

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

Kenley Barrett
 
> I am getting strange results when I run the "corr" command on my
> variables. From my understanding, "corr" gives the correlation
> coefficient, so if a value of 1 for Dummy Variable A guarantees a
> value of 0 for Dummy Variable B, then corr should give a result of -1.
> But instead I am getting values between 0 and -1. A sample of two
> variables shown below:
> 
> . count if wifelit == 1 & wifeprim == 1
>     0
> 
> . count if wifelit == 0 & wifeprim == 1
>  2458
> 
> . corr wifelit wifeprim
> (obs=14316)
> 
>              |  wifelit wifeprim
> -------------+------------------
>      wifelit |   1.0000
>     wifeprim |  -0.1062   1.0000
> 
> What could be the problem? Am I misunderstanding the corr command?

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