Abstract
Given several Gramian matrices, a least-square fit to all the matrices by one factor matrix, with a predetermined number of factors, is shown to be the principal axes solution of the average of the matrices.
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Levin, J. Simultaneous factor analysis of several Gramian matrices. Psychometrika 31, 413–419 (1966). https://doi.org/10.1007/BF02289472
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DOI: https://doi.org/10.1007/BF02289472