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Factors affecting the variability of IRT equating coefficients
Author(s) -
Battauz Michela
Publication year - 2015
Publication title -
statistica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 39
eISSN - 1467-9574
pISSN - 0039-0402
DOI - 10.1111/stan.12048
Subject(s) - equating , mathematics , linkage (software) , statistics , econometrics , item response theory , sample (material) , psychometrics , rasch model , physics , genetics , thermodynamics , biology , gene
Knowing the effect of the factors that can influence the variability of the equating coefficients is an important tool for the development of the linkage plans. This paper explores the effect of various factors on the variability of item response theory equating coefficients. The factors studied are the sample size, the number of common items, the length of the chain, and the possibility of averaging the equating transformations related to different paths that connect the same two forms. Both asymptotic and simulations results are provided.