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Lookup NU author(s): Angela Robinson,
Professor Graham Loomes,
Emeritus Professor Michael Jones-Lee
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Background. It has been argued that visual analog scales (VASs) elicit an individual's measurable value function. The theoretical link between an individual's measurable value function v(.) and his or her von Neumann-Morgenstern utility function u(.) appears to provide a justification for transforming VAS scores into standard gamble (SG) utilities. However, VAS scores have been found to be subject to the effects of context, which casts doubt that the procedure is properly revealing v(.). Methods. The authors tested for the effects of context on VAS and SG scores. They also explored whether the range-frequency (R-F) model of Parducci offers a means of correcting VAS scores for the effects of context. Results and conclusions. The R-F model may provide a means of correcting VAS scores for the effects of context, but no stable relationship exists between these corrected scores and SG utilities. Hence, there remain no grounds for transforming VAS scores into SG utilities.
Author(s): Robinson A, Loomes G, Jones-Lee M
Publication type: Article
Publication status: Published
Journal: Medical Decision Making
ISSN (print): 0272-989X
ISSN (electronic): 1552-681X
Publisher: Sage Publications, Inc.
PubMed id: 11206943
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