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Educational and Psychological Measurement
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On Eigen Values Greater Than Unity and the True Structure of Tests

Steven Robbins

Northwestern University

A 32 item inventory was computer-generated to have a clearly de fined factor structure. N observations were sampled from this struc ture, factor-analyzed and examined for eigen values exceeding unity. Only in the robust N condition (N = 320) was the prescribed structure correctly identified. It was concluded that the use of this procedure for uncovering the internal structure of tests is a special case of sample quantity not quality.

Educational and Psychological Measurement, Vol. 40, No. 4, 875-877 (1980)
DOI: 10.1177/001316448004000408
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