[R] Factor analysis

John Fox jfox at mcmaster.ca
Sat Jun 8 04:38:27 CEST 2002

Dear Marcos,

At 06:06 PM 6/7/2002 -0300, Marcos Sanches wrote:
>         I would like to compare the performance of Principal component 
> method and
>principal axis method with maximum-likelihood because my data is not
>multivariate Normal.

If the data are far from multinormal, then any analysis based on ordinary 
correlations is questionable.

>         Besides, how can I have the communalities with 'factanal' function? I
>didn't find it on html help.
>         Sorry, I am a new R user...

The communalities are the complements of the uniquenesses (i.e., 1 - 
uniqueness). Alternatively, for orthogonally rotated factors, the 
communalities are the row sums of the matrix of factor loadings.

I hope that this helps,

John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox

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