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The Content Reliability of a Test

Published online by Cambridge University Press:  01 January 2025

Harold Gulliksen
Harold Gulliksen*
Affiliation:
University of Chicago
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Abstract

The content unreliability of an essay test is the error due to the items used or the content of the test. The reader unreliability is due to variation in judgment of the persons who read and score the essay test. The content reliability of an essay test is accordingly defined as being independent of the reader reliability. Formulae are derived for the reader reliability and for the content reliability. The content reliability is found to be equal to the geometric mean of the test reliabilities computed from the scores assigned by the two readers, divided by the reader reliability.

Type
Original Paper
Information
Psychometrika , Volume 1 , Issue 3 , September 1936 , pp. 189 - 194
Copyright
Copyright © 1936 The Psychometric Society

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