Test Reliability and Effective Test Length

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1952 English Publisher:Cambridge University Press (CUP)Journal:Psychometrika, volume 18, pages 1-14 (issn: 0033-3123, eissn: 1860-0980,

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Authors: Angoff, William H.;

doi: 10.1007/bf02289023 , 10.1002/j.2333-8504.1952.tb00029.x

Test Reliability and Effective Test Length

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Abstract

Measures of effective test length are developed for speeded and power tests, which are independent of the number of items in the test or of the time required for administration. These measures are used in determining reliability for (1) speeded and power tests, where a separately timed short parallel form is administered in addition to the full-length test; (2) power tests, where a subset of items is imbedded within the total test, parallel to the total test; and (3) power tests, where the subset of items is correlated with the complementary parallel subset in the test.

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