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Direct linkRaykov, Tenko; Dimitrov, Dimiter M.; Marcoulides, George A.; Harrison, Michael – Educational and Psychological Measurement, 2019
Building on prior research on the relationships between key concepts in item response theory and classical test theory, this note contributes to highlighting their important and useful links. A readily and widely applicable latent variable modeling procedure is discussed that can be used for point and interval estimation of the individual person…
Descriptors: True Scores, Item Response Theory, Test Items, Test Theory
Download full textReese, Lynda M.; Pashley, Peter J. – 1999
This study investigated the practical effects of local item dependence (LID) on item response theory (IRT) true-score equating. A scenario was defined that emulated the Law School Admission Test (LSAT) preequating model, and data were generated to assess the impact of different degrees of LID on final equating outcomes. An extreme amount of LID…
Descriptors: College Entrance Examinations, Equated Scores, Item Response Theory, Law Schools
Camilli, Gregory; Wang, Ming-mei; Fesq, Jaqueline – 1992
The Law School Admission Test (LSAT) was examined to see if the items on a form could be divided into different subgroups in which items looked statistically similar within the subgroups but statistically different between subgroups. Of such subgrouping can be detected, it is likely that the subgroups of items measure different abilities, and the…
Descriptors: Admission (School), College Entrance Examinations, Factor Analysis, Item Response Theory
Wang, Xiang-Bo; Harris, Vincent; Roussos, Louis – 2002
Multidimensionality is known to affect the accuracy of item parameter and ability estimations, which subsequently influences the computation of item characteristic curves (ICCs) and true scores. By judiciously combining sections of a Law School Admission Test (LSAT), 11 sections of varying degrees of uni- and multidimensional structures are used…
Descriptors: Ability, College Entrance Examinations, Computer Assisted Testing, Estimation (Mathematics)
De Champlain, Andre F. – 1995
The dimensionality of one form of the Law School Admission Test (LSAT) was assessed with respect to three ethnic groups of test takers. Whether differences in the ability composite have any noticeable impact on item response theory (IRT) true score equating results for these subgroups (African Americans, Hispanic Americans, and Whites) was also…
Descriptors: Ability, Blacks, Equated Scores, Ethnic Groups
von Davier, Alina A., Ed.; Liu, Mei, Ed. – ETS Research Report Series, 2006
This report builds on and extends existent research on population invariance to new tests and issues. The authors lay the foundation for a deeper understanding of the use of population invariance measures in a wide variety of practical contexts. The invariance of linear, equipercentile and IRT equating methods are examined using data from five…
Descriptors: Equated Scores, Statistical Analysis, Data Collection, Test Format
