Re: Obtaining factor scores with inputed matrix

Posted by Art Kendall on Oct 31, 2012; 2:17pm
URL: http://spssx-discussion.165.s1.nabble.com/Obtaining-factor-scores-with-inputed-matrix-tp5715966p5715968.html

You do not have case by case information as input to FACTOR when you have already summarized the data into a correlation matrix.
Therefore, FACTOR cannot create scores   for each case.


Please give more detail so list members can help.
What is the context? Where did the set of items come from? a previously developed scale? new sets of items designed to measure specific constructs?
An available jumble of items that you are exploring? etc.

What are your cases? How many are there? Do you have the raw case by case data or do you only have the correlation matrix?

What do you want to do with the new variables? After you have chosen a number of factor to retain (NOT using Kaiser criterion of eigenvalues greater than 1.00) if you are creating summative scales, if you want the measures to have discriminative validity you would typically look at the varimax rotated loadings, and use unit weights for cleanly loading variables dropping splitters, etc.. There are a few situations where you would want "factor scores". 


What is (are) the response scale(s) on your items? If your items are not severely different from interval level, did you try ordinary correlations?  Do the results look very different? If you feel the intervals are severely discrepant did you try CATPCA?

What stopping rule are you using?







On 10/31/2012 9:28 AM, polisonica wrote:

I am running EFA with SPSS using a polychoric correlation matrix. The factor
analysis runs perfectly until I ask the program to save the factor scores.
Then an error appears: "Factor scores cannot be computed with matrix input."
Has anyone enountered this problem before? Is there any walk-around? I know
I can calculate the factor scores myself, but do not feel confident about it
since most of my variables are categorical and have very different sdv.




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