[R] Factor Analysis

Magill, Brett MagillB at usa.redcross.org
Tue May 1 22:12:15 CEST 2001

Thanks to Brian Ripley for the time and effort put into developing the
factanal package for R.  I have found it very useful.  However, in trying to
replicate some results from previous research, I have run into the need for
a couple of extensions and was wondering if they might find their way into
future implementations.

1.  Though maximum likelihood estimates might be more rigorous and
appropriate as a default, it would be great to have the option of conducting
factor analysis based on  principle factors estimation.

2.  When a Heywood case is encountered, error out saying such.  Provide an
option to perform the analysis anyway setting values to small positive
numbers (although it might be statistically suspect, replicating results
from other studies suggests to me that this is exactly what was done).

Brett A. Magill, Associate
Program Administration and Evaluation
Health, Safety, and Community Services
American Red Cross

Phone:  	(703) 206-7731
Fax: 	(703) 206-7673
E-mail: 	bmagill at usa.redcross.org

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