From: John Fox (firstname.lastname@example.org)
Date: Fri 14 May 2004 - 04:05:12 EST
I assume that the categorical data are ordinal. There are methods for
factor analyzing ordinal data (e.g., using polychoric correlations) and
mixed ordinal and interval data, but as far as I know, these aren't
implemented in R.
On Thu, 13 May 2004 18:32:11 +0200
allan clark <email@example.com> wrote:
> hi all
> this is a stats question.
> when undertaking factor analysis should the variables included always
> continiuos random variables? could one include categorical data? e.g
> some survey type data
> my gut feeling is that one should not include categorical type data
> since factor analysis is based on the eigenanalysis of the
> matrix of a group of variables. The introduction of categorical data
> into a data set might "mess up" the corelation matrix.
> Rfirstname.lastname@example.org mailing list
> PLEASE do read the posting guide!
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