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Using the Rasch model in nursing research: an introduction and illustrative example.
Curt Hagquist1, Malin Bruce, J Petter Gustavsson
1Karlstad University, SE-651 88 Karlstad, Sweden. curt.hagquist@kau.se
International Journal of Nursing Studies
|December 9, 2008
Summary
The Rasch model effectively evaluated the nursing self-efficacy scale, revealing issues with item targeting and categorization. This rigorous analysis highlights the Rasch model
Area of Science:
- Nursing Research
- Psychometrics
- Educational Measurement
Background:
- The nursing self-efficacy (NSE) scale is a key instrument in nursing research.
- Rigorous psychometric evaluation is essential for valid and reliable measurement of nursing self-efficacy.
Purpose of the Study:
- To introduce the Rasch model through its application in nursing research.
- To examine the psychometric properties of the nursing self-efficacy (NSE) scale using the Rasch model.
Main Methods:
- Application of the Rasch model to analyze the psychometric properties of the NSE scale.
- Analysis of item invariance, categorization, and targeting.
- Examination of Differential Item Functioning (DIF) across demographic groups.
- Assessment of multidimensionality and response dependence.
Main Results:
- The original nine-item NSE scale showed high reliability but significant issues with item targeting and categorization.
- A revised seven-item scale demonstrated improved performance, though some items still exhibited misfit.
- Graphical analysis indicated items functioned in the intended direction, despite minor signs of multidimensionality or response dependence.
Conclusions:
- The Rasch model is a valuable tool for rigorous evaluation and development of nursing research instruments.
- It effectively identifies measurement problems, such as lack of invariance, often missed by traditional methods.
- Future development of the NSE scale should prioritize improving item targeting and categorization.
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