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

Author(s):
Lord, Frederic M.
Publication Year:
1973
Report Number:
RB-73-67
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
11
Subject/Key Words:
National Science Foundation (NSF), Mathematical Formulas, Reading Tests, Statistical Analysis, Test Reliability, True Scores

Abstract

When comparing two tests that measure the same trait, an overall comparison is not enough. 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

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