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A Graphical Method for the Rapid Calculation of Biserial and Point Biserial Correlation in Test Research

Published online by Cambridge University Press:  01 January 2025

Howard W. Goheen  and
Melvin D. Davidoff
Howard W. Goheen
Affiliation:
U. S. Civil Service Commission
Melvin D. Davidoff
Affiliation:
U. S. Civil Service Commission
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Abstract

A description is given of a diagram (available separately) for computing biserial or point biserial correlation coefficients. The diagram is maximally useful where large numbers of coefficients are to be calculated in test item analysis. The diagram is entered with the mean criterion score of the group passing the item and the proportion of correct answers to the item.

Type
Original Paper
Information
Psychometrika , Volume 16 , Issue 2 , June 1951 , pp. 239 - 242
Copyright
Copyright © 1951 The Psychometric Society

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Footnotes

*

The diagram is published in reduced size for illustrative purposes only. Interested readers may obtain a copy of the diagram, size 101 x 16 inches, without charge by writing to the Test Development Section, United States Civil Service Commission, Washington 25, D. C., requesting a copy of Test Technical Series No.17.