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Re: st: Tetrachoric Correlation for binary and continuous variables


From   "Stas Kolenikov" <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Tetrachoric Correlation for binary and continuous variables
Date   Mon, 17 Nov 2008 21:57:39 -0600

you can use my -polychoric- package that works for both continuous and
discrete variables computing all of tetrachoric, polychoric, biserial
and polyserial correlations. You can then pick the matrix from
returned values and feed it to -factormat-.

On 11/17/08, Juan Julio Gutierrez <juanju@yahoo.com> wrote:
> 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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>


-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.
*
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