Graded pairs comparison ‐ does strength of preference matter? Analysis of preferences for specialised nurse home visits for pain management
研究了分级配对比较法中偏好强度信息对支付意愿估计效率的影响，发现该信息并未提高统计效率，且有序响应模型会高估支付意愿。
In the stated preference method called graded pairs comparisons respondents are asked to rate the intensity of their preference for their preferred alternative in a pairwise comparison of alternatives. Econometricians anticipate that the additional information will improve statistical efficiency compared to the standard DCE format. However, this paper reveals that added information inherent in graded pairs scale does not provide smaller standard deviations for the WTP estimated. Secondly, the ordered-response regression models employing the full range of the graded pairs data tend to overestimate WTP, which presumably is caused by the inherent tendency of the ordered-response models to 'predict to the extremes'.