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Download full textKang, Taehoon; Petersen, Nancy S. – ACT, Inc., 2009
This paper compares three methods of item calibration--concurrent calibration, separate calibration with linking, and fixed item parameter calibration--that are frequently used for linking item parameters to a base scale. Concurrent and separate calibrations were implemented using BILOG-MG. The Stocking and Lord (1983) characteristic curve method…
Descriptors: Standards, Testing Programs, Test Items, Statistical Distributions
