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Download full textMoses, Tim; Deng, Weiling; Zhang, Yu-Li – Educational Testing Service, 2010
In the equating literature, a recurring concern is that equating functions that utilize a single anchor to account for examinee groups' nonequivalence are biased when the groups are extremely different and/or when the anchor only weakly measures what the tests measure. Several proposals have been made to address this equating bias by incorporating…
Descriptors: Equated Scores, Data Collection, Statistical Analysis, Differences
Walker, Michael E.; Kim, Sooyeon – Educational Testing Service, 2010
This study examined the use of an all multiple-choice (MC) anchor for linking mixed format tests containing both MC and constructed-response (CR) items, in a nonequivalent groups design. An MC-only anchor could effectively link two such test forms if either (a) the MC and CR portions of the test measured the same construct, so that the MC anchor…
Descriptors: Equated Scores, Test Format, Multiple Choice Tests, Statistical Analysis
