Examining ordering effects in discrete choice experiments: A case study in Vietnam

Thang Cong Nguyen, Jackie Robinson, Shinji Kaneko and The Chinh Nguyen

Economic Analysis and Policy, 2015, vol. 45, issue c, 39-57

Abstract: The order of a series of choice tasks presented to respondents in a discrete choice experiment (DCE) could affect the choice outcomes. This study explores the ordering effects in a DCE surveying preferences for improvements in cyclone warning services in Vietnam. Respondentsù choices are analysed non-parametrically and parametrically to investigate the ordering effects in their preferences. Across the sequence of six choice questions, the stated demand of respondents is statistically significantly different at the first position from all other positions. Based on a parametric analysis using mixed logit models, we also find that the willingness-to-pay for a number of improvement programs estimated at the first position is relatively larger when compared with the other positions. The findings indicate that although DCEs can provide additional information on respondentsù preferences when compared with survey methods using a single valuation question, the trade-off for more information is the ordering effects over a sequence of repeated questions.

Date: 2015
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