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Download full textLu, Ru; Haberman, Shelby; Guo, Hongwen; Liu, Jinghua – ETS Research Report Series, 2015
In this study, we apply jackknifing to anchor items to evaluate the impact of anchor selection on equating stability. In an ideal world, the choice of anchor items should have little impact on equating results. When this ideal does not correspond to reality, selection of anchor items can strongly influence equating results. This influence does not…
Descriptors: Test Construction, Equated Scores, Test Items, Sampling
Direct linkDorans, Neil J.; Liu, Jinghua; Hammond, Shelby – Applied Psychological Measurement, 2008
This exploratory study was built on research spanning three decades. Petersen, Marco, and Stewart (1982) conducted a major empirical investigation of the efficacy of different equating methods. The studies reported in Dorans (1990) examined how different equating methods performed across samples selected in different ways. Recent population…
Descriptors: Test Format, Equated Scores, Sampling, Evaluation Methods
