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The TTO method and procedural invariance

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  • Anne Spencer

    (Department of Economics, Queen Mary, University of London, UK)

Abstract

In a pilot study we investigate whether the inferences we draw about people's preferences towards health care treatments are altered if we vary the procedure that is used to elicit these preferences. In a conventional time trade-off (TTO) question, respondents express their preferences towards treatment by comparing a period of ill-health with a shorter period in a higher quality of life. In our less conventional TTO question, we vary the procedure by asking respondents their preferences towards treatment by comparing a period of ill-health with a longer period in a lower quality of life. The quantitative data are equivocal about whether preferences for treatment differ between the conventional and unconventional questions. The qualitative data support the notion of contrasting issues in the questions that involve prolonging time in a lower quality of life and appear to account for a failure to find quantitative differences in all of the questions. Copyright © 2002 John Wiley & Sons, Ltd.

Suggested Citation

  • Anne Spencer, 2003. "The TTO method and procedural invariance," Health Economics, John Wiley & Sons, Ltd., vol. 12(8), pages 655-668.
  • Handle: RePEc:wly:hlthec:v:12:y:2003:i:8:p:655-668 DOI: 10.1002/hec.768
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    References listed on IDEAS

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    2. Peter Wakker & Daniel Deneffe, 1996. "Eliciting von Neumann-Morgenstern Utilities When Probabilities Are Distorted or Unknown," Management Science, INFORMS, vol. 42(8), pages 1131-1150, August.
    3. 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.
    4. Alan Diener & Bernie O'Brien & Amiram Gafni, 1998. "Health care contingent valuation studies: a review and classification of the literature," Health Economics, John Wiley & Sons, Ltd., vol. 7(4), pages 313-326.
    5. Dolan, Paul & Cookson, Richard, 2000. "A qualitative study of the extent to which health gain matters when choosing between groups of patients," Health Policy, Elsevier, vol. 51(1), pages 19-30, February.
    6. Dolan, Paul, 1996. "Modelling valuations for health states: the effect of duration," Health Policy, Elsevier, vol. 38(3), pages 189-203, December.
    7. 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.
    8. Paul Dolan & Colin Green, 1998. "Using the person trade-off approach to examine differences between individual and social values," Health Economics, John Wiley & Sons, Ltd., vol. 7(4), pages 307-312.
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    Citations

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    Cited by:

    1. Rosalie Viney & Elizabeth Savage, 2006. "Health care policy evaluation: empirical analysis of the restrictions implied by Quality Adjusted Life Years, CHERE Working Paper 2006/10," Working Papers 2006/10, CHERE, University of Technology, Sydney.
    2. 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.
    3. Oliver, Adam & Wolff, Jonathan, 2014. "Are people consistent when trading time for health?," Economics & Human Biology, Elsevier, vol. 15(C), pages 41-46.
    4. Richard T. Carson, 2011. "Contingent Valuation," Books, Edward Elgar Publishing, number 2489.
    5. Ken Buckingham & Nancy Devlin, 2006. "A theoretical framework for TTO valuations of health," Health Economics, John Wiley & Sons, Ltd., vol. 15(10), pages 1149-1154.
    6. Buckingham, K. & Devlin, N. & Tabberer, M., 2004. "A theoretical framework for TTO valuations and a taxonomy of TTO approaches: results from a pilot study," Working Papers 04/07, Department of Economics, City University London.
    7. Richard Norman & Rosalie Viney, 2008. "The effect of discounting on quality of life valuation using the Time Trade-Off, CHERE Working Paper 2008/3," Working Papers 2008/3, CHERE, University of Technology, Sydney.
    8. Anne Spencer, 2004. "The implications of linking questions within the SG and TTO methods," Health Economics, John Wiley & Sons, Ltd., vol. 13(8), pages 807-818.
    9. 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.
    10. Arthur E. Attema & Werner B. F. Brouwer, 2008. "Can we fix it? Yes we can! But what? A new test of procedural invariance in TTO-measurement," Health Economics, John Wiley & Sons, Ltd., vol. 17(7), pages 877-885.
    11. Bleichrodt, Han & Pinto, Jose Luis & Maria Abellan-Perpinan, Jose, 2003. "A consistency test of the time trade-off," Journal of Health Economics, Elsevier, vol. 22(6), pages 1037-1052, November.
    12. 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.

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