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A Method of Score Conversion Through Item Statistics

Published online by Cambridge University Press:  01 January 2025

Frances Swineford  and
Chung-Teh Fan
Frances Swineford
Affiliation:
Educational Testing Service
Chung-Teh Fan
Affiliation:
Educational Testing Service
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Abstract

A method is presented for converting the scores on one form of a test to those on another form of the same test. The method is particularly applicable to the case where each form has been administered to a different group and the only link between the two forms is a subset of items common to both. The proposed method, called the item method of conversion, has been applied to several tests for which other methods of conversion are available for comparison. The necessary data are limited to tests for which the total score is the criterion for item analyses. The method gives highly satisfactory results for all the tests to which it has been applied, particularly when the two groups are rather different, in which case the delta method (a different item method) is inappropriate.

Type
Original Paper
Information
Psychometrika , Volume 22 , Issue 2 , June 1957 , pp. 185 - 188
Copyright
Copyright © 1957 Psychometric Society

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Footnotes

*

The authors are only two of a group, including W. H. Angoff, F. M. Lord, and M. K. Schultz, all of whom have made important contributions to this paper.

References

Fan, C. T. On the applications of the method of absolute scaling. Psychometrika, 1957, 22, 175–183CrossRefGoogle Scholar
Gulliksen, H. Theory of mental tests, New York: Wiley, 1950CrossRefGoogle Scholar