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Guilford

J. P.

Psychometric methods. New York: McGraw-Hill, 1954.

Lord

F. M.

Tests of the same length do have the same standard error of measurement. Educational and Psychological Measurement, 1959, 19, 233–239.

McMorris

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Evidence on the quality of several approximations for commonly used measurement statistics. Journal of Educational Measurement, 1972, 9, 113–122.

Nunnally

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