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An Empirical Comparison of Methods for Equating with Randomly Equivalent Groups of 50 to 400 Test Takers. Research Report. ETS RR-10-05
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Livingston, Samuel A.; Kim, Sooyeon – ETS Research Report Series, 2010
A series of resampling studies investigated the accuracy of equating by four different methods in a random groups equating design with samples of 400, 200, 100, and 50 test takers taking each form. Six pairs of forms were constructed. Each pair was constructed by assigning items from an existing test taken by 9,000 or more test takers. The…
Descriptors: Equated Scores, Accuracy, Sample Size, Sampling