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2.
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Plasse, W. B. "A Comparison of Factors of Achievement in College and Adult Life." Unpublished Ph.D. thesis, Syracuse University, 1948.
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Rao, C. R. "Estimation and Tests of Significance in Factor Analysis." Psychometrika, XX (1955), 93-111 .
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Thurstone, L. L.Multiple-Factor Analysis . Chicago: The University of Chicago Press, 1947.
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Wallace, D. G. "A Description and Interpretation of the Activities and Opinions of Syracuse University Graduates Related to General Education." Unpublished Ph.D. thesis, Syracuse University, 1949.
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