Re: Before and after experiment using factor analysis

Posted by Swank, Paul R on Apr 28, 2011; 5:06pm
URL: http://spssx-discussion.165.s1.nabble.com/Before-and-after-experiment-using-factor-analysis-tp4346460p4347097.html

This means your scale is not invariant over time. It could be that the intervention plays a role in causing the change but it does mean that any change over time is confounded with a change in the construct definition.

Dr. Paul R. Swank,
Professor and Director of Research
Children's Learning Institute
University of Texas Health Science Center-Houston


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of kimberley2314
Sent: Thursday, April 28, 2011 8:23 AM
To: [hidden email]
Subject: Before and after experiment using factor analysis

Hello,

I'm doing an experiment where I'm measuring consumers attitude before and
after seeing an advertisement. For the questions before and after the
advertisement I'm using the same scale that measures two dimensions.
However, when I'm doing an factor analysis on those 2 questions I can
extract 2 factors in each question, but they don't consist of the same
items...
My question is if I can compare the corresponding factors...? (the
corresponding factors do measure the same dimensions but they don't consist
of the same items after conducting the factor analysis)

Kind regards,
Kimberley

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