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Korean Journal of Psychology: General

ISSN : 1229-067X

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Vol.31 No.4

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An Evaluation of lz as a Measure of Person Fit Under Graded Response Models

Korean Journal of Psychology: General / Korean Journal of Psychology: General, (P)1229-067X; (E)2734-1127
2012, v.31 no.4, pp.1023-1041
Younyoung Choi (Department of Counseling Psychology Hanyang Cyber University)
Young Il Cho (Department of Psychology Sungshin Women's University)
Choi, Y., & Cho, Y. I. (2012). An Evaluation of lz as a Measure of Person Fit Under Graded Response Models. Korean Journal of Psychology: General, 31(4), 1023-1041.

Abstract

A person-fit analysis (PFA) has been developed to identify individuals whose latent traits are not measured accurately by a test. This study investigated the distribution and effectiveness of a person-fit index: the standardized log-likelihood index (lz) for Graded Response Model(GRM). Findings in simulation studies employing various manipulated variables demonstrated that the empirical distribution of the lz were close to the standard normal distribution and the lz was effective in detecting individuals showing aberrant response patterns given the IRT model (i.e., graded response models). The application of the lz to the empirical data of the Rosenberg Self-Esteem scale (1965, 1979) illustrated that GRM was suitable to the scale, producing relatively few individuals of a significantly large value.

keywords
Person-fit index, Standardized log-likelihood index, Polytomous items, Aberrant testing behavior, Rosenberg self-esteem scale
Submission Date
2012-06-30
Revised Date
2012-10-03
Accepted Date
2012-10-29

Korean Journal of Psychology: General

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