, Volume 18, Issue 1, pp 1–14 | Cite as

Test reliability and effective test length

  • William H. Angoff


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.


Public Policy Statistical Theory Test Reliability Power Test Parallel Form 
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Copyright information

© Psychometric Society 1953

Authors and Affiliations

  • William H. Angoff
    • 1
  1. 1.Educational Testing ServiceUSA

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