Date: Wed, 15 Nov 2006 06:20:41 -0500
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From: Statisticsdoc <firstname.lastname@example.org>
Subject: Re: PCA factor score uses?
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Yes, the scores can be used as dependent variables.
Factor scores are standardized with Mean = 0 and SD = 1 , so your groups are
quite different from one another.
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From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU]On Behalf Of
Fredric E. Rose
Sent: Tuesday, November 14, 2006 10:18 PM
Subject: PCA factor score uses?
I'm not entirely familiar with PCA and could use some help.
I've used PCA w/varimax rotation to reduce 10 variables (answers to a racism
attitudes questionnaire) down to 2 factors. I want to know if the
calculated factor scores for each participant can then be used as a
dependent variable in subsequent analyses, or whether I should simply
combine the variables loading on the respective factors and use those? My
problem is in interpreting the factor scores: Group 1 has a mean of -2.72
and Group 2 has a mean of 2.68. These are significantly different, but I'm
not sure what the means represent (the raw data are scores ranging from 1 to
10, so there are no negatives).
Thanks for any insight.