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| From | "Joseph Coveney" <jcoveney@bigplanet.com> |
| To | <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: RE: FW: Running Polychoric Principal Component Analysis in STATA |
| Date | Sun, 26 Aug 2012 15:56:40 +0900 |
In addition to Cameron's references for parallel analysis, there is also a user-written Stata command -paran- and corresponding write-up in _The Stata Journal_ ( http://www.stata-journal.com/article.html?article=st0166 ). -findit paran- brings up a couple of sources: SSC and another on author's website, which I assume is more up-to-date. It's not specifically intended for ordered polytomous variables and I don't know how well its parallel analysis methods fare in comparison to those of articles in Cameron's list that are focused on categorical variables. -paran- calls the official Stata command -pca-, and without alteration it would not work with -polychoricpca-. If I understand -paran-'s licensing correctly, you can make a copy of the ado-file and modify the copy to instead call -polychoricpca- and use its returned matrices. I don't know how much effort that would be. Joseph Coveney * * 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/