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Re: st: factor analysis - interpreting the results, inclusion of dp variable


From   "georg wernicke" <georg.wernicke@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: factor analysis - interpreting the results, inclusion of dp variable
Date   Mon, 13 Aug 2007 17:21:47 +0100

Hello SR Millis,

is significant colliearity now rulled out? regarding my initial
question, do i include the dp in the factor analysis equation or how
do i interprete the result of only four factors being found?

thank you once again,

george

On 8/13/07, SR Millis <srmillis@yahoo.com> wrote:
> Having ruled out significant colliearity, I should
> also mention that Harrell (2001) provides some useful
> guidelines for variable selection:
>
> 1. Use the literature to eliminate unimportant
> variables.
>
> 2. Eliminate variables having narrow distributions.
>
> 3. Eliminate variable having a lot of missing data.
>
> 4. Consider a type of oblique-rotation principal
> components analysis.
>
> SR Millis
>
> Harrell, F. (2001). Regression modeling strategies:
> With applications to linear models, logistic
> regression, and survival analysis. New York:
> Springer-Verlag.
>
>
>
> --- SR Millis <srmillis@yahoo.com> wrote:
>
> > Thanks, George. Regarding collinearity, what was the
> > highest condition index?  And, for any condition
> > index
> > greater than 30, were there any large
> > variance-decomposition proportions (ie, greater than
> > .5)?
> >
> > SR Millis
> >
> >
> > --- georg wernicke <georg.wernicke@googlemail.com>
> > wrote:
> >
> > > hello,
> > >
> > > my sample size are 874 observation. i used the
> > > comand collin and
> > > coldiag2 for diagnostics. all the vifs were way
> > > below 10, the highest
> > > was 6.5.
> > >
> > > thanks again,
> > >
> > > georg
> >
> >
> > Scott R Millis, PhD, MEd, ABPP (CN,CL,RP), CStat
> > Professor & Director of Research
> > Dept of Physical Medicine & Rehabilitation
> > Wayne State University School of Medicine
> > 261 Mack Blvd
> > Detroit, MI 48201
> > Email:  smillis@med.wayne.edu
> > Tel: 313-993-8085
> > Fax: 313-966-7682
> > *
> > *   For searches and help try:
> > *
> > http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
>
>
> Scott R Millis, PhD, MEd, ABPP (CN,CL,RP), CStat
> Professor & Director of Research
> Dept of Physical Medicine & Rehabilitation
> Wayne State University School of Medicine
> 261 Mack Blvd
> Detroit, MI 48201
> Email:  smillis@med.wayne.edu
> Tel: 313-993-8085
> Fax: 313-966-7682
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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