Checking the Statistical Equivalence of Nearly Identical Test Editions |
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| Abstract: | A procedure for checking the score equivalence of nearly identical editions of a test is described. This procedure is used early in the score equating process to help determine whether it is necessary to conduct separate equating analyses (using a variety of equating methods) for the two nearly identical versions of the test. The procedure employs the standard error of equating and utilizes graphical representation of score conversion deviation from the identity function in standard error units. Two illustrations of the procedure involving Scholastic Aptitude Test (SAT) data are presented. Advice about what to do if statistical equivalence does not obtain is given in the discussion section. Alternative strategies for assessing score equivalence are also discussed. |
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