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Correction of Item-Total Correlations in Item Analysis

Published online by Cambridge University Press:  01 January 2025

Sten Henrysson
Sten Henrysson*
Affiliation:
University of Stockholm
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Abstract

The biserial correlation between an item and the total test of which the item is a part tends to be misleadingly high when used in item analysis, since the item is included in the total test. Two formulas with correction for this overlap are derived and compared with Zubin's and Guilford's formulas. One of the new coefficients is invariant to test length.

Type
Original Paper
Information
Psychometrika , Volume 28 , Issue 2 , June 1963 , pp. 211 - 218
Copyright
Copyright © 1963 The Psychometric Society

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References

Guilford, J. P. Psychometric methods (2nd ed.), New York: McGraw-Hill, 1954.Google Scholar
Gulliksen, H. Theory of mental tests, New York: Wiley, 1950.CrossRefGoogle Scholar
Zubin, J. The method of internal consistency for selecting test items. J. educ. Psychol, 1934, 25, 345–356.CrossRefGoogle Scholar