Dear Mark,
> -----Original Message-----
> From: Mark Strivens [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 09, 2004 9:52 PM
> To: John Fox
> Cc: [EMAIL PROTECTED]
> Subject: Re: [R] R conversion
>
> Thanks John for the post - I had found factanal However
> factanal it seems you have specify the number of factors to
> be fitted up front, whereas with the SAS procedure you don't
> - this is apparently important to the analysis!
>
With ML factor analysis, you can test how many factors are required.
> Perhaps I could emulate this function by breaking it down
> using factor extraction by principal component analysis and
> the doing the varimax rotation second? If that makes any sense?
>
Yes -- it shouldn't be hard to write your own PA factor-analysis function,
if that's what you prefer. For principal-components analysis, see ?princomp
and ?prcomp [which are turned up by help.search("principal components"), by
the way].
Regards,
John
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