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ERIC Number: EJ802623
Record Type: Journal
Publication Date: 2007
Pages: 21
Abstractor: As Provided
Reference Count: 38
ISSN: ISSN-0211-2159
The External Validity of Scores Based on the Two-Parameter Logistic Model: Some Comparisons between IRT and CTT
Ferrando, Pere J.; Chico, Eliseo
Psicologica: International Journal of Methodology and Experimental Psychology, v28 n2 p237-257 2007
A theoretical advantage of item response theory (IRT) models is that trait estimates based on these models provide more test information than any other type of test score. It is still unclear, however, whether using IRT trait estimates improves external validity results in comparison with the results that can be obtained by using simple raw scores. This paper discusses some methodological results based on the 2-parameter logistic model (2PLM) and is concerned with three issues: first, how validity coefficients based on IRT trait estimates must be interpreted; second, how inferences about these coefficients can be made; and third, which differences in external validity can be expected if the 2PLM is correct for the data and IRT scores are used in place of raw scores. Four empirical examples in the personality domain provided further evidence for the results that can be expected in real research in which the model is, at best, a good approximation to the data. A general result of these examples was that validity coefficients based on IRT scores were similar to those based on raw scores. (Contains 1 figure and 5 tables.)
University of Valencia. Dept. Metodologia, Facultad de Psicologia, Avda. Blasco Ibanez 21, 46010 Valencia, Spain. Tel: +34-96-386-4100; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Childrens Manifest Anxiety Scale