Difficulty prediction of test items. New York, Bureau of Publications, Teachers College, Columbia University, 1947.
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Educational tests and measurements.
Contributions to education, no. 941.
55 p. 22 cm.
Originally presented as the author's thesis, Columbia.
Reprint of the 1947 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 941.
Bibliography: p. 54-55.
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