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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Generate one score for 2+ factors? |
| Date | Thu, 27 Jun 2013 09:56:30 +0200 |
On Wed, Jun 26, 2013 at 7:52 PM, Nick Cox wrote: > If you want a single construct to use you > need really good arguments not to use Factor 1. One situation where you might choose Factor 2 over Factor 1 can occur when you have a set of question where some are phrased positive and others are phrased negative. There is a tendency for respondents to agree with whatever is being said, and the first factor may pick that up. You'll see that when the first factor loads highly on all positively phrased statements and has low loadings for the negatively phrased statements (or vice versa). That would be a case where I would consider the first factor as measuring an uninteresting artefact, and I would move on to the next factor. -- Maarten --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/