Posted by
Kooij, A.J. van der on
Jun 29, 2006; 12:37pm
URL: http://spssx-discussion.165.s1.nabble.com/Re-Can-factors-identified-using-factor-analysis-on-a-smaller-dataset-be-used-on-larger-dataset-tp1069427.html
You can do this using CATPCA if you have SPSS Categories. If you have
continuous variables you can
discretize them (by using CATPCA Discretization option multiply) and use
numerical scaling level.
Specify the unhealty persons as supplementary cases. These cases will
not be included in the analysis, but will be fitted into the factor
solution found for the healthy persons.
To examine relations between factors and demographic variables you
include the demographic variables in the CATPCA variable list, and in
the analysis variables list with Multiple Nominal scaling level, and
specify them as supplementary variables, then they are not included in
the PCA but are fitted into the found solution.
For relationships between the factors and demographic variables you can
inspect the loadings plot with centroids included (centroid points are
the points for the categories of the demographic variables). To examine
relations between persons and variables you can inspect the biplot
(including object(person) points and loadings) and the triplot
(including object(person) points, loadings and centroids).
Regards,
Anita van der Kooij
Data Theory Group
Leiden University
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Naila Baig-Ansari
Sent: 29 June 2006 12:36
To:
[hidden email]
Subject: Can factors identified using factor analysis on a smaller
dataset be used on larger dataset?
I used exploratory factor analysis to find 3 factors describing eating
patterns in healthy persons in my dataset. I also generated factor
scores and examined the relationship of the scores obtained to a number
of demographic variables such as age, ethnicity, socioeconomic status,
etc.
I would now like to use the 3 factors identified to my entire dataset
that includes healthy and unhealthy persons and examine relationships to
demographic variables. How do I do this in SPSS? Is there any way of
generating factor scores for the remaining dataset based on the factors
identified through the exploratory factor analysis?
Thanks for any insight
Naila
**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.
**********************************************************************