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Can we fix it? Yes we can! But what? A new test of procedural invariance in TTO-measurement

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  • Arthur E. Attema

    (Department of Economics, Erasmus University, Rotterdam, The Netherlands)

  • Werner B. F. Brouwer

    (Department of Health Policy and Management & Institute for Medical Technology Assessment, Erasmus University|Erasmus MC, Rotterdam, The Netherlands)

Abstract

The TTO-method is often used to value health states, but it is susceptible to several biases and methodological difficulties. One of these is a violation of procedural invariance, which means that the way a TTO-question is framed, i.e. either by fixing the period in imperfect health or that in perfect health, can have a substantial effect on the elicited value of a health state. There are four important sources of discrepancy of the two procedures: loss aversion, maximum endurable time, scale compatibility and discounting. In this article, we present the results of a new test of procedural invariance in which we avoided or corrected for two of these sources (discounting and maximum endurable time). Our results indicate that while correcting for discounting does diminish the difference between the two TTO-procedures, a large and significant violation of procedural invariance remains. Loss aversion is probably the main determinant of the remainder of this difference. Copyright © 2007 John Wiley & Sons, Ltd.

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Bibliographic Info

Article provided by John Wiley & Sons, Ltd. in its journal Health Economics.

Volume (Year): 17 (2008)
Issue (Month): 7 ()
Pages: 877-885

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Handle: RePEc:wly:hlthec:v:17:y:2008:i:7:p:877-885

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Web page: http://www3.interscience.wiley.com/cgi-bin/jhome/5749

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  1. Kahneman, Daniel & Knetsch, Jack L & Thaler, Richard H, 1990. "Experimental Tests of the Endowment Effect and the Coase Theorem," Journal of Political Economy, University of Chicago Press, vol. 98(6), pages 1325-48, December.
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  4. Han Bleichrodt & José Luis Pinto & José María Abellán-Perpiñán, 2003. "A consistency test of the time trade-off," Economics Working Papers 676, Department of Economics and Business, Universitat Pompeu Fabra.
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  7. Anne Spencer, 2003. "The TTO method and procedural invariance," Health Economics, John Wiley & Sons, Ltd., vol. 12(8), pages 655-668.
  8. Bleichrodt, Han & Gafni, Amiram, 1996. "Time preference, the discounted utility model and health," Journal of Health Economics, Elsevier, vol. 15(1), pages 49-66, February.
  9. Dolan, Paul & Jones-Lee, Michael, 1997. "The time trade-off: A note on the effect of lifetime reallocation of consumption and discounting," Journal of Health Economics, Elsevier, vol. 16(6), pages 731-739, December.
  10. Han Bleichrodt, 2002. "A new explanation for the difference between time trade-off utilities and standard gamble utilities," Health Economics, John Wiley & Sons, Ltd., vol. 11(5), pages 447-456.
  11. Tversky, Amos & Kahneman, Daniel, 1991. "Loss Aversion in Riskless Choice: A Reference-Dependent Model," The Quarterly Journal of Economics, MIT Press, vol. 106(4), pages 1039-61, November.
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Cited by:
  1. F. E. van Nooten & X. Koolman & W. B. F. Brouwer, 2009. "The influence of subjective life expectancy on health state valuations using a 10 year TTO," Health Economics, John Wiley & Sons, Ltd., vol. 18(5), pages 549-558.
  2. Attema, Arthur & Brouwer, Werner, 2012. "Deriving time discounting correction factors for TTO tariffs," MPRA Paper 37002, University Library of Munich, Germany.
  3. Attema, Arthur & Brouwer, Werner, 2012. "In search of a preferred preference elicitation method: A test of the internal consistency of choice and matching tasks," MPRA Paper 36100, University Library of Munich, Germany.
  4. 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.
  5. Arthur Attema & Yvette Edelaar-Peeters & Matthijs Versteegh & Elly Stolk, 2013. "Time trade-off: one methodology, different methods," The European Journal of Health Economics, Springer, vol. 14(1), pages 53-64, July.
  6. 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, vol. 13(4), pages 491-500, August.

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