Quick Estimates of the Relative Efficiency of Two Tests as a Function of Ability Level.

Lord, Frederic M.

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Peer reviewed

ERIC Number: EJ108462

Record Type: CIJE

Publication Date: 1974

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Quick Estimates of the Relative Efficiency of Two Tests as a Function of Ability Level

Lord, Frederic M.

Journal of Educational Measurement, 11, 4, 247-54, W 74

When comparing two tests that measure the same trait, separate comparisons should be made at different levels of the trait. A simple, practical, approximate formula is given for doing this. The adequacy of the approximation is illustrated using data comparing seven nationally known sixth-grade reading tests. (Author/RC)

Descriptors: Ability Identification, Comparative Analysis, Reading Tests, Statistical Analysis, Test Reliability, Tests

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