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Jackknifing Techniques for Evaluation of Equating Accuracy GPCM IRT

Author(s):
Haberman, Shelby J.; Lee, Yi-Hsuan; Qian, Jiahe
Publication Year:
2009
Report Number:
RR-09-39
Source:
ETS Research Report
Document Type:
Report
Page Count:
37
Subject/Key Words:
True-Score Equating Method, Generalized Partial-Credit Model (GPCM), Two-Parameter Logistic Model, Item Response Theory (IRT)

Abstract

Grouped jackknifing may be used to evaluate the stability of equating procedures with respect to sampling error and with respect to changes in anchor selection. Properties of grouped jackknifing are reviewed for simple-random and stratified sampling, and its use is described for comparisons of anchor sets. Application is made to examples of item response theory (IRT) true-score equating in which two-parameter logistic and general partial credit models are employed.

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