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RE: st: RE: Negative eigen values in factor, pf command?


From   "Verkuilen, Jay" <JVerkuilen@gc.cuny.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Negative eigen values in factor, pf command?
Date   Tue, 28 Apr 2009 15:43:21 -0400

Michael I. Lichter wrote:
  
>So what are you advocating instead? ML, which isn't very robust to
weirdness (technical term) in the data? Or something other than >FA/PCA?

No, I'm following the research of people like Rod McDonald (retired to
his beloved Sydney), Albert Maydeu-Olivares (Barcelona) and Bud McCallum
(UNC-Chapel Hill), who support the use of the Unweighted Least Squares
criterion function, or multi-stage estimation methods that uses ULS
followed by a few iterations of ML or GLS. ULS is mathematically
equivalent to MINRES. Stata doesn't have ULS/MINRES (alas). 

One of the downsides to ULS is the fact that it doesn't generate
standard errors and GoF statistics, but Albert's been rectifying that
situation in a sequence of articles in various journals (Psychometrika,
JASA, etc.): http://www.ub.edu/gdne/psicometriaen.html. 



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