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ROTATE <factor_matrix>,<#_of_factors>,L / ROTATION=QUARTIMIN
makes the oblique Quartimin rotation.
Reference:
Carroll, John.B. (1953). An analytical solution for approximating
simple structure in factor analysis. Psychometrika, 18, 23-38.
See also  Harman: Modern Factor Analysis, 2nd ed., pp. 318-324.

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