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The Determination of Item Difficulty When Chance Success is a Factor

Published online by Cambridge University Press:  01 January 2025

J. P. Guilford
J. P. Guilford*
Affiliation:
University of Nebraska
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Abstract

The evaluation of the level of difficulty of a test item is ordinarily derived from the proportion of a specified population passing or failing the item. With items that have a limited number of alternative responses there must be a correction in this proportion to make allowance for chance success. A table of corrected proportions is given for different numbers of alternatives varying from two to eight.

Type
Original Paper
Information
Psychometrika , Volume 1 , Issue 4 , December 1936 , pp. 259 - 264
Copyright
Copyright © 1936 The Psychometric Society

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Footnotes

*

J. P. Guilford, Psychometric Methods, New York: McGraw-Hill, 1986, p. 438.