The Relative Efficiency of Two Tests As a Function of Ability Level.

Lord, Frederic M.

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Peer reviewed

ERIC Number: EJ108449

Record Type: Journal

Publication Date: 1974

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The Relative Efficiency of Two Tests As a Function of Ability Level

Lord, Frederic M.

Psychometrika, 39, 3, 351-8, Sep 74

A new formula, expressing relative efficiency solely in terms of the standard errors of measurement and the frequency of distributions of true scores, is developed for the relative efficiency of two tests measuring the same trait. Subtests from the Scholastic Aptitude Test provide a numerical illustration. (Author/RC)

Descriptors: Error of Measurement, Measurement Techniques, Testing, True Scores

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Identifiers - Assessments and Surveys: SAT (College Admission Test)

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