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Download full textWei, Youhua; Morgan, Rick – ETS Research Report Series, 2016
As an alternative to common-item equating when common items do not function as expected, the single-group growth model (SGGM) scaling uses common examinees or repeaters to link test scores on different forms. The SGGM scaling assumes that, for repeaters taking adjacent administrations, the conditional distribution of scale scores in later…
Descriptors: Equated Scores, Growth Models, Scaling, Computation
