Nonparametric IRT Analysis of Quality-of-Life Scales and Its Application to the World Health Organization Quality-of-Life Scale (WHOQOL-Bref)

Nonparametric IRT Analysis of Quality-of-Life Scales and Its Application to the World Health Organization Quality-of-Life Scale (WHOQOL-Bref)

Background This study investigates the usefulness of the nonparametric monotone homogeneity model for evaluating and constructing Health-Related Quality-of-Life Scales consisting of polytomous items, and compares it to the often-used parametric graded response model. Methods The nonparametric monoto...

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Veröffentlicht in:Quality of Life Research. - Springer Science + Business Media. - 17(2008), 2, Seite 275-290
1. Verfasser: Sijtsma, Klaas (VerfasserIn)
Weitere Verfasser: Emons, Wilco H. M., Bouwmeester, Samantha, Nyklíček, Ivan, Roorda, Leo D.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2008
Zugriff auf das übergeordnete Werk:Quality of Life Research
Schlagworte:Health-related quality-of-life measurement Item response theory Nonparametric monotone homogeneity model Parametric graded response model Mathematics Applied sciences Behavioral sciences Philosophy Education Health sciences Economics
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520 |a Background This study investigates the usefulness of the nonparametric monotone homogeneity model for evaluating and constructing Health-Related Quality-of-Life Scales consisting of polytomous items, and compares it to the often-used parametric graded response model. Methods The nonparametric monotone homogeneity model is a general model of which all known parametric models for polytomous items are special cases. Merits, drawbacks, and possibilities of nonparametric and parametric models and available software are discussed. Particular attention is given to the monotone homogeneity model (also known as the Mokken model), and the oftenused parametric graded response model. Results Data from the WHOQOL-Bref were analyzed using both the monotone homogeneity model and the graded response model. The monotone homogeneity model analysis yielded unidimensional scales for each content domain. Scalability coefficients further showed that some items have limited scalability with respect to the other items in the same scale. The parametric IRT analyses lead to the rejection of some of the items. Conclusions The nonparametric monotone homogeneity model is highly suited for data analysis in a health-related quality-of-life context, and the parametric graded response model may add interesting features to measurement provided the model fits the data well. 
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