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Reliability and the Nonequivalent Groups With Anchor Test Design NEAT

Author(s):
Moses, Tim P.; Kim, Sooyeon
Publication Year:
2007
Report Number:
RR-07-16
Source:
ETS Research Report
Document Type:
Report
Page Count:
40
Subject/Key Words:
Reliability, Non-Equivalent-Groups Anchor Test (NEAT) Design, Levine Observed-Score Equating, Tucker Equating

Abstract

Ten equating methods were considered: chained linear, chained equipercentile with raw and smoothed frequencies, Tucker, frequency estimation equipercentile with raw and smoothed frequencies, Levine observed using Angoff-estimated and the “correct” reliabilities based on the data generation model used in this study, and Levine true using Angoff-estimated and correct reliabilities. The results were consistent with what is known about equating functions and their variability. Unequal and/or low reliability inflates equating function variability and alters equating functions when population abilities differ.

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