Continuous and discrete latent structure models for item response data |
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Authors: | Edward H Haertel |
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Institution: | (1) School of Education, Standford University, 94305-3096 Standford, California |
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Abstract: | Relations are examined between latent trait and latent class models for item response data. Conditions are given for the two-latent class and two-parameter normal ogive models to agree, and relations between their item parameters are presented. Generalizationss are then made to continuous models with more than one latent trait and discrete models with more than two latent classes, and methods are presented for relating latent class models to factor models for dichotomized variables. Results are illustrated using data from the Law School Admission Test, previously analyzed by several authors. |
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Keywords: | latent structure latent class latent trait item analysis dichotomous factor analysis Law School Admission Test (LSAT) |
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