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On the Equivalence of Collectively and Individually Collected Responses

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  • Paul F.M. Krabbe
  • Marie-Louise Essink-Bot
  • Gouke J. Bonsel

Abstract

The standard-gamble and time-tradeoff methods for valuing health states were com pared in a multifactorial design with 104 student volunteers. The main aim of the ex periment was to compare average individual responses with group responses for the same tradeoff tasks. Group responses were collected using an interactive voting sys tem. The standard EuroQol system was used to describe the health states to be val ued. Generalizability theory was used to analyze the results. The averages and median values of the individual responses differed from the interactively collected group values only for the more severe health states. The results showed almost identical results for the two methods, but the time tradeoff was found to be more consistent than the standard gamble. The authors conclude that 1) there is significant similarity between the results of individual and collective response modes, and 2) the standard-gamble and time-tradeoff methods produce almost equivalent values, despite their different conceptual backgrounds. In this study the aggregated individual responses and the collective response proved to be sufficiently similar to support the validity of using aggregated individual valuations as a measure of the valuation of the group. Key words: collective judgment; standard gamble; time tradeoff; methodology; voting sys tem ; EuroQol; generalizability theory. (Med Decis Making 1996;16:120-132)

Suggested Citation

  • Paul F.M. Krabbe & Marie-Louise Essink-Bot & Gouke J. Bonsel, 1996. "On the Equivalence of Collectively and Individually Collected Responses," Medical Decision Making, , vol. 16(2), pages 120-132, June.
    • Handle: RePEc:sae:medema:v:16:y:1996:i:2:p:120-132
    DOI: 10.1177/0272989X9601600204
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    References listed on IDEAS

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    1. van Agt, Heleen M. E. & Essink-Bot, Marie-Louise & Krabbe, Paul F. M. & Bonsel, Gouke J., 1994. "Test-retest reliability of health state valuations collected with the EuroQol questionnaire," Social Science & Medicine, Elsevier, vol. 39(11), pages 1537-1544, December.
    2. Brooks, Richard G. & Jendteg, Stefan & Lindgren, Bjorn & Persson, Ulf & Bjork, Stefan, 1991. "EuroQol(c): health-related quality of life measurement. Results of the Swedish questionnaire exercise," Health Policy, Elsevier, vol. 18(1), pages 37-48, June.
    3. Nord, Erik, 1991. "EuroQol(c): health-related quality of life measurement. Valuations of health states by the general public in Norway," Health Policy, Elsevier, vol. 18(1), pages 25-36, June.
    4. Torrance, George W., 1976. "Social preferences for health states: An empirical evaluation of three measurement techniques," Socio-Economic Planning Sciences, Elsevier, vol. 10(3), pages 129-136.
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    1. Arthur E. Attema & Han Bleichrodt & Olivier l’Haridon & Stefan A. Lipman, 2020. "A comparison of individual and collective decision making for standard gamble and time trade-off," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 21(3), pages 465-473, April.
    2. 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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