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The external validity of scores based on the twoparameter logistic model: Some comparisons between IRT and CTT

  • Identification data

    Identifier: imarina:6385568
    Authors:
    Ferrando, Pere JChico, Eliseo
    Abstract:
    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.
  • Others:

    Author, as appears in the article.: Ferrando, Pere J; Chico, Eliseo
    Department: Psicologia
    URV's Author/s: CHICO LIBRAN, ELISEO / Ferrando Piera, Pere Joan
    Keywords: Test psicológicos Teoria de respostes als items Statistics Social desirability Scale Reliability Personality Item response theory Extraversion Classical test theory Ability
    Abstract: 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.
    Thematic Areas: Statistics and probability Psychology, experimental Psychology (miscellaneous) Psicología Experimental and cognitive psychology Developmental and educational psychology Ciencias sociales Ciencias humanas Arts and humanities (miscellaneous)
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 0211-2159
    Author's mail: perejoan.ferrando@urv.cat
    Author identifier: 0000-0002-3133-5466
    Last page: 257
    Record's date: 2024-10-19
    Journal volume: 28
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://www.uv.es/psicologica/articulos2.07/8FERRANDO.pdf
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Psicologica. 28 (2): 237-257
    APA: Ferrando, Pere J; Chico, Eliseo (2007). The external validity of scores based on the twoparameter logistic model: Some comparisons between IRT and CTT. Psicologica, 28(2), 237-257
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2007
    First page: 237
    Publication Type: Journal Publications
  • Keywords:

    Arts and Humanities (Miscellaneous),Developmental and Educational Psychology,Experimental and Cognitive Psychology,Psychology (Miscellaneous),Psychology, Experimental,Statistics and Probability
    Test psicológicos
    Teoria de respostes als items
    Statistics
    Social desirability
    Scale
    Reliability
    Personality
    Item response theory
    Extraversion
    Classical test theory
    Ability
    Statistics and probability
    Psychology, experimental
    Psychology (miscellaneous)
    Psicología
    Experimental and cognitive psychology
    Developmental and educational psychology
    Ciencias sociales
    Ciencias humanas
    Arts and humanities (miscellaneous)
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