Nick,
I'm sorry, I should have included all possible counts. I have pasted
them below. To be sure that I understand properly: this correlation
coefficient is due the fact that although a value of 1 for wifelit
guarantees a value of 0 for wifeprim, and a value of 1 for wifeprim
guarantees a value of 0 for wifelit, a value of 0 for wifeprim does
NOT guarantee a value of 1 for wifelit, and a value of 0 for wifelit
does NOT guarantee a value of 1 for wifeprim. So the correlation
coefficient should not be -1 (as I was thinking earlier). Could you
please confirm for me that I'm understanding this right? I'm sorry to
bother you again; I am new at this, as you can tell.
Thank you very much for your help.
Kenley
. count if wifelit == 1 & wifeprim == 1
0
. count if wifelit == 0 & wifeprim == 1
2458
. count if wifelit == 0 & wifeprim == 0
11119
. count if wifelit == 1
739
. count if wifeprim == 1
2458
. count if wifelit == 1 & wifeprim == 0
739
. corr wifelit wifeprim
(obs=14316)
| wifelit wifeprim
-------------+------------------
wifelit | 1.0000
wifeprim | -0.1062 1.0000
On Thu, 17 Feb 2005 15:58:32 -0000, Nick Cox <[email protected]> wrote:
> 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
> [email protected]
>
> 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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>
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