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From |
Kenley Barrett <kenley.barrett@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: strange results with corr |

Date |
Thu, 17 Feb 2005 10:12:12 -0600 |

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 <n.j.cox@durham.ac.uk> 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 > 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? > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: strange results with corr***From:*"Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>

**References**:**st: RE: strange results with corr***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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