[R] Principal component analysis with EQUAMAX rotation
lists at revelle.net
Fri Jun 20 18:36:27 CEST 2014
I added the equamax rotation option to the psych package in version 1.4.6. This was requested by Sagnik Chakravarty, with a solution by Gunter Nickel.
Unfortunately, the version on CRAN is 1.4.5, but you can get the working prerelease of 1.4.6 (220.127.116.11) from the alternate repository http://personality-project.org/r/ (if using a Mac) or http://personality-project.org/r/src/contrib/ if using a PC.
p3e <- principal(Thurstone,3,rotate="equamax") #will extract the first three components and rotate them using equamax.
p3n <- principal(Thurstone,3,rotate="none") #will give you the unrotated 3 component solution
p3v <- principal(Thurstone,3,rotate="varimax") #for the varimax solution
factor.congruence(list(p3e,p3n,p3v)) #compares the Burt/Tucker congruence coefficients for these three solutions
Let me know if this does what you want.
On Jun 19, 2014, at 2:07 AM, Wagner <wagner.fab at gmx.de> wrote:
> I need to do a principal component analysis with EQUAMAX-rotation.
> Unfortunately the function principal() I use normally for PCA does not offer
> this rotation specification. I could find out that this might be possible
> somehow with the package GPArotation but until now I could not figure out
> how to use this in the principal component analysis.
> Maybe someone can give an example on how to do an equamax-rotation PCA?
> Or is there a function in another package that offers the use of
> equamax-rotation directly?
> Thank you for your help!
> View this message in context: http://r.789695.n4.nabble.com/Principal-component-analysis-with-EQUAMAX-rotation-tp4692337.html
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William Revelle http://personality-project.org/revelle.html
Department of Psychology http://www.wcas.northwestern.edu/psych/
Northwestern University http://www.northwestern.edu/
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