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ROTATE <factor_matrix>,<#_of_factors>,L  / ROTATION=ENTROPY
makes Jennrich's orthogonal CLF rotation using the entropy criterion.
See
Jennrich, R.I. (2004). Rotation to simple loadings using component
loss functions: The orthogonal case. Psychometrika, 69, 257-273.
http://preprints.stat.ucla.edu/402/revision.pdf 

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