Jorien Veldwijk|Domino Determann|Mattijs Lambooij|Janine A. van Til|Ida J. Korfage|Esther W. de Bekker?Grob|G. Ardine de Wit
Exploring how individuals complete the choice tasks in a discrete choice experiment: an interview study
National Institute for Public Health and the Environment|National Institute for Public Health and the Environment|National Institute for Public Health and the Environment|University of Twente|Erasmus MC|Erasmus MC|University Medical Center Utrecht
able make valid inferences stated preference data discrete choice experiment dce essential researchers know participants actively involved understood interpreted provided information correctly whether used complex decision strategies make choices thereby acted accordance continuity axiom structured interviews explored 70 participants evaluated completed four discrete choice tasks aloud hereafter additional questions asked explore participants understood information provided whether used complex decision strategies continuity axiom making choices two existing dce questionnaires rotavirus vaccination prostate cancerscreening served case studies large proportion participants able repeat exact definition risk attributes explained introduction questionnaire majority participants preferred optimal less optimal risk attribute levels participants 66 mentioned three attributes motivating decisions thereby acting accordance continuity axiom however 16 70 participants continuously mentioned less three attributes motivating decision lower educated less literate participants tended mention less three attributes motivating decision used trading attributes less often decisionmaking strategy majority participants seemed understood provided information choice tasks attributes levels used complex decision strategies continuity axiom therefore capable adequately complete dce however based participants age educational level health literacy additional actions undertaken ensure participants understand choice tasks complete dce presumed