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Re: st: Generate one score for 2+ factors?


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Generate one score for 2+ factors?
Date   Thu, 27 Jun 2013 11:09:24 +0100

That's an example of a very good argument.
Nick
njcoxstata@gmail.com


On 27 June 2013 08:56, Maarten Buis <maartenlbuis@gmail.com> wrote:
> 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
> ---------------------------------
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