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st: Polychoric Correlation

Subject   st: Polychoric Correlation
Date   Fri, 16 Sep 2005 15:32:29 +0000

Hi all:
I'm trying use polychoric command to get correlation between categorical variables. There are about 2000 observations. 
Gender: male=1 female=2   and stress: yes=1 and no=0
I'm getting this "conformability error".
polychoric  gender Stress
conformability error
Why am I getting this error?  I'm using STATA 7.
Please advise me. Thanks

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