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A Simple Scoring Weight for Test Items and its Reliability

Published online by Cambridge University Press:  01 January 2025

J. P. Guilford
J. P. Guilford*
Affiliation:
University of Southern California
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Abstract

It is pointed out that the scoring weights for test items should be approximations to regression-equation weights. For this reason any estimate of reliability of the weight should not be permitted to influence the size of the weight but should be used in determining the limit of acceptability of an item. A simple approximation weight is recommended for general use, and an abac is provided for the estimation of it when the correlation between item and criterion is the phi coefficient. A formula for the standard error of this weight is derived and tables of significant and very significant weights are presented in terms of deviations from the median weight.

Type
Original Paper
Information
Psychometrika , Volume 6 , Issue 6 , December 1941 , pp. 367 - 374
Copyright
Copyright © 1941 The Psychometric Society

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References

Guilford, J. P. The phi coefficient and chi square as indices of item validity. Psychometrika, 1941, 6, 11–19.Google Scholar
Kelley, T. L. The scoring of alternative responses with reference to some criterion. J. educ. Psychol., 1934, 25, 504–510.CrossRefGoogle Scholar
Kelley, T. L. Statistical Methods, New York: Macmillan Company, 1924.Google Scholar