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RE: st: Aren't distinct factors from factor analysis or PCA orthogonal to each other?


From   "Verkuilen, Jay" <JVerkuilen@gc.cuny.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Aren't distinct factors from factor analysis or PCA orthogonal to each other?
Date   Mon, 17 Aug 2009 12:36:56 -0400

Diana Kornbrot wrote:

>Is it possible to hierarchical EFA in stata?
>Are there do  files?

What do you mean by hierarchical EFA? If you mean higher order factor analysis, i.e., imposing a factor structure on the factor covariance matrix, I suspect the answer is not at the present time. You could always extract the factor correlation matrix from an oblique rotation and work with the Schmid-Leiman transformations yourself. 

However, for a confirmatory model I suspect you could set this up in -gllamm- but I'd sure want to test it carefully on examples that I was certain about. I believe there are some examples of this in the PROC CALIS documentation in SAS/Stat, for instance.... Just checked. It's a replicated example of some data from Thurstone from R. P. McDonald (1985), Factor Analysis and Related Methods, LEA, , p.57, p.105. 

Jay

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