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Combining Rasch and cluster analysis: a novel method for developing rheumatoid arthritis states for use in valuation studies

Author

Listed:
  • McTaggart-Cowan, H
  • Brazier, J
  • Tsuchiya, A

Abstract

Purpose: Health states that describe an investigated condition are a crucial component of valuation studies. The health states need to be distinct, comprehensible, and data-driven. The objective of this study was to describe a novel application of Rasch and cluster analyses in the development of three rheumatoid arthritis health states. Methods: The Stanford Health Assessment Questionnaire (HAQ) was subjected to Rasch analysis to select the items that best represent disability. K-means cluster analysis produced health states with the levels of the selected items. The pain and discomfort domain from the EuroQol-5D was incorporated at the final stage. Results: The results demonstrate a methodology for reducing a dataset containing individual disease-specific scores to generate health states. The four selected HAQ items were bending down, climbing steps, lifting a cup to your mouth, and standing up from a chair. Conclusions: Overall, the combined use of Rasch and cluster analysis has proved to be an effective technique for identifying the most important items and levels for the construction of health states.

Suggested Citation

  • McTaggart-Cowan, H & Brazier, J & Tsuchiya, A, 2008. "Combining Rasch and cluster analysis: a novel method for developing rheumatoid arthritis states for use in valuation studies," MPRA Paper 29834, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:29834
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    File URL: https://mpra.ub.uni-muenchen.de/29834/1/MPRA_paper_29834.pdf
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    References listed on IDEAS

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    1. Brooks, Richard AU -, 1996. "EuroQol: the current state of play," Health Policy, Elsevier, vol. 37(1), pages 53-72, July.
    2. Marra, Carlo A. & Woolcott, John C. & Kopec, Jacek A. & Shojania, Kamran & Offer, Robert & Brazier, John E. & Esdaile, John M. & Anis, Aslam H., 2005. "A comparison of generic, indirect utility measures (the HUI2, HUI3, SF-6D, and the EQ-5D) and disease-specific instruments (the RAQoL and the HAQ) in rheumatoid arthritis," Social Science & Medicine, Elsevier, vol. 60(7), pages 1571-1582, April.
    3. Young, Tracey A. & Yang, Y & Brazier, J & Tsuchiya, A, 2007. "The use of Rasch analysis as a tool in the construction of a preference based measure: the case of AQLQ," MPRA Paper 29802, University Library of Munich, Germany.
    4. Young, Tracey A. & Yang, Y & Brazier, J & Tsuchiya, A & Coyne, K, 2008. "Making Rasch decisions: the use of Rasch analysis in the construction of preference based health related quality of life instruments," MPRA Paper 29828, University Library of Munich, Germany.
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    1. McTaggart-Cowan, H & O'Cathain, A & Tsuchiya, A & Brazier, J, 2009. "A qualitative study exploring the general population’s perception of rheumatoid arthritis after being informed about disease adaptation," MPRA Paper 29836, University Library of Munich, Germany.

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    More about this item

    Keywords

    health state; Rasch analysis; cluster analysis; quality of life; rheumatoid arthritis;
    All these keywords.

    JEL classification:

    • I31 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - General Welfare, Well-Being
    • I19 - Health, Education, and Welfare - - Health - - - Other

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