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st: Tetrachoric Correlation for binary and continuous variables


From   Juan Julio Gutierrez <juanju@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Tetrachoric Correlation for binary and continuous variables
Date   Mon, 17 Nov 2008 19:05:04 -0800 (PST)

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


      
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