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Related Experiment Videos

Psychometric evaluation of the outcome based performance measures.

J M Kern1, C S Firth

  • 1Department of Psychology, University of Nevada-Las Vegas 89154-5030, USA. JKern@Nevada.edu

Psychological Reports
|November 22, 2000
PubMed
Summary

Outcome Based Performance Measures show good reliability for evaluating services for individuals with intellectual disabilities. Factor analysis confirmed groupings, suggesting minor revisions for this important assessment tool.

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Area of Science:

  • Disability Services Evaluation
  • Psychometrics
  • Intellectual Disability Assessment

Background:

  • Outcome Based Performance Measures (OBPM) are standard tools for accrediting disability service organizations.
  • Assessing the psychometric properties of OBPM is crucial for ensuring accurate evaluation.
  • Previous research has not fully explored OBPM's factor structure in diverse populations.

Purpose of the Study:

  • To evaluate the interrater reliability of the OBPM.
  • To assess the difficulty levels of individual OBPM items.
  • To examine the factor structure of the OBPM using factor analysis.

Main Methods:

  • The study involved 448 individuals with intellectual disabilities in Nevada.
  • Interrater reliability was calculated for OBPM items.

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  • Factor analysis was employed to determine the underlying factor structure.
  • Item difficulty was analyzed based on participant responses.

    • Main Results:

    • The OBPM demonstrated strong interrater reliability.
    • Most items were found to have appropriate levels of difficulty.
    • Factor analysis identified seven distinct factors.
    • Item loadings showed moderate variation from previous studies but aligned with logical groupings.

    Conclusions:

    • The OBPM is a reliable measure for evaluating services for individuals with intellectual disabilities.
    • The identified factor structure supports the measure's validity, with minor adjustments recommended.
    • Further research could refine OBPM item groupings based on these findings.