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Maximizing split-half reliability estimates for projective techniques.

E E Wagner, R A Alexander, G Roos

    Journal of Personality Assessment
    |December 1, 1985
    PubMed
    Summary
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    This study found that split-half reliability analysis for the Hand Test yields superior results compared to the odd-even method. Projective tests may possess greater internal reliability than previously understood.

    Area of Science:

    • Psychological assessment
    • Psychometrics
    • Clinical psychology

    Background:

    • Assessing the reliability of psychological tests is crucial for valid clinical interpretation.
    • The Hand Test is a widely used projective assessment tool.
    • Previous reliability estimates for projective tests may be underestimated.

    Purpose of the Study:

    • To evaluate the internal reliability of the Hand Test using advanced split-half analysis.
    • To compare the efficacy of different split-half reliability methods.
    • To reassess the psychometric properties of projective measures.

    Main Methods:

    • Analysis of Hand Test data from comparable clinical samples.
    • Application of the standard odd-even split-half reliability method.

    Related Experiment Videos

  • Calculation of all possible split-half combinations (126) for comprehensive assessment.

    • Main Results:

    • Maximum stable reliability coefficients were achieved using the all-possible split-half method.
    • These results demonstrated substantially superior reliability compared to the odd-even split method.
    • The findings indicate robust internal consistency for the Hand Test.

    Conclusions:

    • The all-possible split-half combination method offers a more accurate assessment of test reliability.
    • Projective tests, including the Hand Test, exhibit higher internal reliability than commonly reported.
    • This research supports the psychometric soundness of projective assessment techniques.