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Postexamination analysis of objective tests using the three-parameter item response theory.

Mohsen Tavakol, Mohammad Rahimi-Madiseh, Reg Dennick

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    This study applied three-parameter item response theory (IRT) to evaluate and enhance an objective nursing test. Findings help educators improve assessment quality and teaching strategies.

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    Area of Science:

    • Educational Measurement
    • Psychometrics in Nursing Education
    • Health Professions Education Assessment

    Background:

    • Item Response Theory (IRT) is crucial in health education but underutilized in nursing for test development.
    • Existing nursing assessments may lack optimal discrimination across student ability levels.

    Purpose of the Study:

    • To evaluate the psychometric properties of a real-world objective test using three-parameter IRT.
    • To identify and address psychometric weaknesses in nursing education assessments.

    Main Methods:

    • Application of three-parameter IRT model for test item analysis.
    • Monitoring and improvement of test item quality using psychometric indices.

    Main Results:

    • Analysis of item parameter indices, item characteristic curves (ICCs), and test information functions.
    • Identification of aberrant items that fail to measure the intended construct accurately.

    Conclusions:

    • The study provides actionable insights for enhancing assessment quality in nursing education.
    • Results can inform improvements in teaching strategies and curriculum development.
    • Utilizing IRT aids in creating more effective and psychometrically sound educational assessments.