On the Rank of the Reduced Correlational Matrix in Multiple-Factor Analysis
Walter Ledermann · Psychometrika · 1937
Since the factor problem is reduced mathematically to the expression of the obtained correlational matrix in terms of a matrix of lower rank, criteria for the determination of this lower rank are of first importance. These criteria are investigated by means of certain mathematical deductions, and brought into relation with Spearman's and Thurstone's factor theories.