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Proportional Heuristics in Time Tradeoff and Conjoint Measurement

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  • Peep F.M. Stalmeier
  • Thom G.G. Bezembinder
  • Ivana J. Unic

Abstract

The time-tradeoff (TTO) test is widely used to measure quality of life for different health states. Subjects are asked to equate the value of living a given period in an inferior health state to the value of living a shorter period in good health. Applications of TTOs have been criticized based on the fact that the value of future life duration is taken as the future life duration itself. The authors show that for a health state in which a subject does not want to live longer than a specified amount of time, subjects' responses do not comply with the assumption that the value of the period in inferior health is equated to the value of the shorter period in good health Actually, preference reversals with respect to such a health state point to the use of a proportional heuristic in the TTO test. Comparisons of the TTO test in these subjects with category scaling and difference measurements also favor a proportional inter pretation of the TTO test. In tests based on conjoint measurement, these subjects also appear to use a proportional heuristic. Consequences of the use of the TTO test and conjoint measurement m quality-of-life models are discussed Key words: utility assessment, QALY, conjoint measurement; preference reversals; compatibility effect. (Med Decis Making 1996;16:36-44)

Suggested Citation

  • Peep F.M. Stalmeier & Thom G.G. Bezembinder & Ivana J. Unic, 1996. "Proportional Heuristics in Time Tradeoff and Conjoint Measurement," Medical Decision Making, , vol. 16(1), pages 36-44, February.
    • Handle: RePEc:sae:medema:v:16:y:1996:i:1:p:36-44
    DOI: 10.1177/0272989X9601600111
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    References listed on IDEAS

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    1. Hogarth, Robin M. (ed.), 1990. "Insights in Decision Making," University of Chicago Press Economics Books, University of Chicago Press, edition 1, number 9780226348551, December.
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    1. Arthur Attema & Werner Brouwer, 2012. "The way that you do it? An elaborate test of procedural invariance of TTO, using a choice-based design," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 13(4), pages 491-500, August.
    2. Attema, Arthur E. & Brouwer, Werner B.F., 2012. "A test of independence of discounting from quality of life," Journal of Health Economics, Elsevier, vol. 31(1), pages 22-34.
    3. Attema, Arthur E. & Brouwer, Werner B.F., 2009. "The correction of TTO-scores for utility curvature using a risk-free utility elicitation method," Journal of Health Economics, Elsevier, vol. 28(1), pages 234-243, January.
    4. Spencer, Anne & Rivero-Arias, Oliver & Wong, Ruth & Tsuchiya, Aki & Bleichrodt, Han & Edwards, Rhiannon Tudor & Norman, Richard & Lloyd, Andrew & Clarke, Philip, 2022. "The QALY at 50: One story many voices," Social Science & Medicine, Elsevier, vol. 296(C).
    5. Carol A.E. Nickerson, 1999. "Assessing Convergent Validity of Health-state Utilities Obtained Using Different Scaling Methods," Medical Decision Making, , vol. 19(4), pages 487-498, October.
    6. James K. Hammitt, 2002. "QALYs Versus WTP," Risk Analysis, John Wiley & Sons, vol. 22(5), pages 985-1001, October.
    7. Arthur Attema & Yvette Edelaar-Peeters & Matthijs Versteegh & Elly Stolk, 2013. "Time trade-off: one methodology, different methods," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 14(1), pages 53-64, July.
    8. Arthur E. Attema & Werner B.F. Brouwer, 2014. "Deriving Time Discounting Correction Factors For Tto Tariffs," Health Economics, John Wiley & Sons, Ltd., vol. 23(4), pages 410-425, April.
    9. Peasgood, T & Ward, S & Brazier, J, 2010. "A review and meta-analysis of health state utility values in breast cancer," MPRA Paper 29950, University Library of Munich, Germany.
    10. Sylvie M. C. van Osch & Anne M. Stiggelbout, 2008. "The construction of standard gamble utilities," Health Economics, John Wiley & Sons, Ltd., vol. 17(1), pages 31-40, January.

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