gerben_janse@HOTMAIL.COM replied: >The following excerpts I copied from: > >http://www.ats.ucla.edu/stat/sas/library/factor_ut.htm > >Factor analysis as a generic term includes principal component >analysis. While the two techniques are functionally very similar and >are used for the same purpose (data reduction), they are quite >different in terms of underlying assumptions. > >.... > >There are still other methods of estimating communalities available in >SAS. Interested readers should refer to SAS manual[4]. Some method >should be chosen, because SAS by default sets all prior communalities >to 1.0, which is the same as requesting a principal components >analysis. This default setting has caused misunderstanding among the >novice users who are not aware of the consequence of overlooking the >default settings. Many researchers claim to have conducted a common >factor analysis when actually a principal components analysis was >performed. > >Hope this is what you mean, > >Gerben > >PS Se voce quer, eu posso tentar ajudar voce em portugues (that's what >they speak in Brazil, David) tambem.

Dang. Mea Culpa. Mary (maryidahosas) pointed this out to me also. I got a glitch in my wetware: I was thinking this post was from Spain, while the 'joint inclusion probabilities' post wqas from Brazil.

I do know the difference between Portuguese and Spanish, and I really can find Brazil on a map. :-)

David -- David L. Cassell mathematical statistician Design Pathways 3115 NW Norwood Pl. Corvallis OR 97330

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