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Wolkowitz, Amanda; Davis-Becker, Susan – Practical Assessment, Research & Evaluation, 2015
This study evaluates the impact of common item characteristics on the outcome of equating in credentialing examinations when traditionally recommended representation is not possible. This research used real data sets from several credentialing exams to test the impact of content representation, item statistics, and number of common items on…
Descriptors: Test Items, Equated Scores, Licensing Examinations (Professions), Test Content
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Wiliam, Dylan – Review of Research in Education, 2010
The idea that validity should be considered a property of inferences, rather than of assessments, has developed slowly over the past century. In early writings about the validity of educational assessments, validity was defined as a property of an assessment. The most common definition was that an assessment was valid to the extent that it…
Descriptors: Educational Assessment, Validity, Inferences, Construct Validity