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Improving the Individual Work Performance Questionnaire using Rasch analysis.
Linda Koopmans1, Claire M Bernaards, Vincent H Hildebrandt
1VU University Medical Center, Amsterdam, The Netherlands, hcw.devet@vumc.nl.
Journal of Applied Measurement
|June 21, 2014
Summary
The Individual Work Performance Questionnaire (IWPQ) 1.0 was refined using Rasch analysis, improving its ability to measure worker performance across all levels. This enhanced version offers better discrimination and change detection for individual work performance.
Area of Science:
- Psychometrics
- Occupational Health Psychology
Background:
- The Individual Work Performance Questionnaire (IWPQ) version 0.2 was previously developed using Rasch analysis.
- Refinement of measurement tools is crucial for accurate assessment of individual work performance.
Purpose of the Study:
- To enhance the targeting of the IWPQ scales by incorporating additional items.
- To develop a final version (IWPQ 1.0) with improved psychometric properties.
Main Methods:
- Rasch analysis was applied to IWPQ version 0.2 and a version with additional items (IWPQ 0.3).
- Items showing misfit or not improving targeting were removed to finalize IWPQ 1.0.
- Key measurement requirements including model fit, reliability, category ordering, unidimensionality, and differential item functioning were examined.
Main Results:
- The final IWPQ 1.0 demonstrated good model fit and reliability.
- Improved targeting was observed for two out of three scales compared to the previous version.
- The refined questionnaire enhances measurement precision for workers at all ability levels.
Conclusions:
- The final IWPQ 1.0 is a psychometrically sound instrument for assessing individual work performance.
- The improved version offers enhanced reliability, discrimination, and sensitivity to change.
- This updated questionnaire supports more accurate evaluation of workforce capabilities.
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