Classical Test Score Equating

Abstract

Test equating procedures are statistical score adjustment procedures that are used when alternate forms of educational and psychological tests are constructed to a common set of content and statistical specifications. Alternate forms enhance the security of tests and allow for examinees to be tested more than one time with a different set of test questions. Even though efforts are made by test developers for the alternate forms to be equivalent, such forms differ somewhat in difficulty. A data collection design is necessary for conducting equating. Equating also involves application of statistical methodology. Traditional equating methods equate score distributions. In this entry, equating designs and traditional equating methods are described. Error in equating is considered. Selected practical issues are also discussed.

A comparison of the revised Delirium Rating Scale (DRS–R98) and the Memorial Delirium Assessment Scale (MDAS) in a palliative care cohort with DSM–IV delirium

“…Conversions were extracted from the first assessment and then tested in the second data assessment. The conversion rule is derived according to the following equation (Kolen & Tong, 2005): where μ( X ) is the mean score of the referred variable (in this case, MDAS), σ( X ) the standard deviation of MDAS scores, μ( Y ) the mean DRS–R98 score, σ( Y ) the standard deviation of DRS–R98 scores, and l γ the linear equating function.…”