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The Scale Proposed for the Academic Ability Test IRT

Lord, Frederic M.
Publication Year:
Report Number:
ETS Research Memorandum
Document Type:
Page Count:
Subject/Key Words:
Academic Ability, Cooperative Academic Ability Test, Cognitive Tests, Difficulty Level, Item Response Theory (IRT), Scaling, Test Interpretation


The scale proposed by Tucker for the Academic Ability Test is designed to provide a score that is interpreted in terms of the level of difficulty of the task that the examinee can perform successfully. This type of interpretation is in direct contrast to the usual type of interpretation of a score in terms of the proportion of examinees in some specified group who obtain lower scores; or in terms of the level of the group (with respect to age, education, etc.) for which the given score represents average performance.

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