Differences between Continuous and Discrete Contingent Value Estimates
通过食品安全改善支付意愿的分样本条件价值研究，发现二分选择法比连续法产生更高的支付意愿估计，差异主要源于受访者行为而非统计方法，且连续法显示显著范围效应而二分法未显示。
In a split-sample contingent valuation study of willingness to pay (WTP) for food safety improvements, the dichotomous choice (DC) elicitation method consistently generated much larger estimates of WTP than did a continuous method. Little or none of these differences was due to bias introduced by the statistical techniques used with the DC data. Most or all of the difference was due to differences in respondent behavior. In addition, the continuous WTP responses showed a significant scope effect, while the DC responses did not. The observed difference in behavior may be attributable in part to yea-saying by DC respondents.