Making both ends neat: exploring the effects of modifying the TTO protocol on non-trading and all-in trading
The corner answers in time trade-off, TTO, i.e. non-trading (NT) and assigning utility of -1 — all-intrading (AIT), occur frequently and impact the resulting models and value sets. Non-trading worsens the discriminatory power for mild health states. All-in-trading means the average utility estimates are biased upwards (models with censoring help but require parametric assumptions). We aim to test if modifying the TTO protocol lowers the frequency of NT/AIT.
We will use three arms in computer assisted face-to-face TTO data collection: a control arm (resembling cTTO) and two experimental arms (approx. 150 respondents each). We will test modifications: e.g., asking respondents if finer granularity would get them to trade; or improving the alternative with the diseased state (by adding some years in full health) instead of worsening the full health alternative; or use a diseased state in both compared profiles in the worse-than dead domain. We will compare the proportion of NT/AIT between the arms and see if modifications improve the association between state severity and utility in the worse-than-dead domain.
Oxford project lead:
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Yaling Yang
Senior Researcher in Health Economics
Collaborators:
PI: Dr. Michał Jakubczyk (SGH Warsaw School of Economics, Decision Analysis and Support Unit)
Members of EuroQol Valuation Working Group
Dates:
2019 – 2021
Funder:
EuroQol Foundation
Our team
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Stavros Petrou
Academic Research Lead in Health Economics
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Lucy Abel
Health Economist, DPhil student
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Felix Achana
Senior Researcher in Health Economics
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Laura Armitage
Wellcome Trust Doctoral Research Fellow
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Corneliu Bolbocean
Senior Researcher in Health Economics
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Laia Bosque Mercader
Research Fellow in Health Economics
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Lin Bowker-Lonnecker
DPhil Student
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John Buckell
Researcher
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Padraig Dixon
Senior Researcher in Health Economics
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Patrick Fahr
Quantitative Researcher
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Carmen Fierro Martinez
NIHR Pre-Doctoral Fellow
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Nadeem Hussein
NIHR Pre-Doctoral Fellow
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Joseph Kwon
Researcher in Health Economics
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Sungwook Kim
Senior researcher in Health Economics
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Joan Madia
Researcher in Health Economics
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Joaquim Vidiella Martin
Researcher in Economics
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Catia Nicodemo
Senior Research Fellow in Health Economics
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Olu Onyimadu
Health Economist, DPhil Candidate
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May Png
Senior Researcher in Health Economics
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Stuart Redding
Project Lead, Centre for Health Service Economics & Organisation
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Elizabeth-Ann Schroeder
Senior Researcher in Health Economics
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Apostolos Tsiachristas
Associate Professor
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Raphael Wittenberg
Deputy Director, Centre for Health Service Economics and Organisation
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Yaling Yang
Senior Researcher in Health Economics