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avi
Posts:
18
Registered:
3/25/09


Re: Factor analysis rotation methods
Posted:
Feb 22, 2011 12:39 PM


On 22 fév, 19:06, Art Kendall <A...@DrKendall.org> wrote: > In SPSS you can do any form of rotation on FACTOR. Since this capability > has been in SPSS since at least 1973, it is most like available in other > packages. > In what ever package you use you can factor analyze made up data and > write the loadings. That way you can see how to format the existing > loadings. > > > FACTOR performs factor analysis based either on correlations or > > covariances and using one of the seven extraction methods. FACTOR also > > accepts matrix input in the form of correlation matrices, covariance > > matrices, or factorloading matrices and can write the matrix > > materials to a matrix data file. > > Matrix Input and Output. With the MATRIX subcommand, you can write a > > correlation matrix, a covariance matrix, or a factorloading matrix. > > You can also read matrix materials written either by a previous FACTOR > > procedure or by a procedure that writes correlation or covariance > > matrices. > > What is your application that you would favor an oblique rotation? Are > you going to use the factor scores as a set in some other GLM procedure? > SEM? > > Are you using factor analysis to see what items to assign to a scoring > key in scale development? If so, what about divergent validity being > lower because an item would be included in more than one summation? > > Art Kendall > Social Research Consultants > > On 2/22/2011 11:31 AM, avi wrote: > > > > > > > > > Hello, > > > Is there some simple script or a detailed algorithm for creating an > > oblique rotation or a QUARTIMAX from the unrotated loadings and > > correlation matrix of the variables? > > > Thanks > > Avi
Actually, I try to write an generic utility to be used by other users for whatever purpose. The utility knows in its present state to perform Varimax and I want to add other rotations possibilities. The utility uses VB
Avi



