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From |
"Verkuilen, Jay" <JVerkuilen@gc.cuny.edu> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Tetrachoric Correlation for binary and continuous variables |

Date |
Tue, 18 Nov 2008 11:40:41 -0500 |

You could use -polychoric- as Stas mentions. WARNING: Such matrices are sometimes not positive definite. If you need to do factor analysis with variables of mixed type, you may want to set things up as a confirmatory analysis and use -gllamm- instead, or consider using software explicitly set up for analysis of mixed variables such as Mike Neale's MX (free!) or Mplus. -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Juan Julio Gutierrez Sent: Monday, November 17, 2008 10:05 PM To: statalist@hsphsun2.harvard.edu Subject: st: Tetrachoric Correlation for binary and continuous variables Dear all, I want to perform a factor analysis. My set of variables combine binary and continous variables. I understand that the Tetrachoric Correlation is used to identify reasonable covariance matrices for binary data, before performing factor analysis. When reading the Stata online help, it seems that the comand tetrachoric var1 var2 var3, will treat all as binary variables, when for example var3 is actually countinuous. the problem is how to perform tetrachoric only in the subset of binary vars and then perform factor in both binary and continuous vars? Thanks a lot Juan Julio * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Tetrachoric Correlation for binary and continuous variables***From:*Juan Julio Gutierrez <juanju@yahoo.com>

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