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- Title
Evidence of range bias in contingent valuation payment scales (This research forms part of the evaluation of the UK Flexiscope trial of colorectal cancer screening, funded by the Medical Research Council.).
- Authors
David K. Whynes; Jane L. Wolstenholme; Emma Frew
- Abstract
The payment scale format has been widely used in willingness-to-pay studies in health care. Concerns have been expressed that the format is, in theory, prone to range bias, although this proposition has not been tested directly. We report the findings of a contingent valuation questionnaire study of colorectal cancer screening, wherein different subjects were provided with payment scales of two different lengths. Whilst the long-scale instrument included scale values up to £1000, the short-scale version extended only to £100. After controlling for inter-sample differences in, for example, income, education and health behaviour, it emerged that the long-scale instrument produced a mean willingness to pay more than 30% higher than that resulting from the short-scale version. We believe our findings to be strongly supportive of the likelihood of range bias in payment-scale instruments, with important consequences for the estimation of both average valuation and consumer surplus. Copyright © 2003 John Wiley & Sons, Ltd.
- Subjects
CONTINGENT valuation; PAYMENT; WILLINGNESS to pay; MEDICAL care; COLON cancer; MEDICAL screening; MEDICAL economics
- Publication
Health Economics, 2004, Vol 13, Issue 2, p183
- ISSN
1057-9230
- Publication type
Article
- DOI
10.1002/hec.809