标题： 在模型不确定性下的共识群体决策，着眼于环境政策制定 显示英文标题

标题： Consensus group decision making under model uncertainty with a view towards environmental policy making

摘要： 在本文中，我们提出了一种在模型不确定性下的共识群体决策方案，该方案由一个迭代的两阶段过程组成，并基于Fréchet众数的概念。 每个步骤包括两个阶段：代理首先通过由代理之间即时交互表征的局部众数在意见度量空间中更新其位置，然后协调者根据全局众数提出建议，并在每一步检查共识。 在大型异构群体的情况下，可以通过一个辅助的初始同质化步骤来补充该过程，该步骤包括意见空间中的聚类过程，导致大的同质群体，然后将上述过程应用于这些群体。 该方案通过来自环境经济学的示例进行说明。 显示英文摘要

摘要： In this paper we propose a consensus group decision making scheme under model uncertainty consisting of an iterative two-stage procedure and based on the concept of Fr\'echet barycenter. Each step consists of two stages: the agents first update their position in the opinion metric space by a local barycenter characterized by the agents' immediate interactions and then a moderator makes a proposal in terms of a global barycenter, checking for consensus at each step. In cases of large heterogeneous groups the procedure can be complemented by an auxiliary initial homogenization step, consisting of a clustering procedure in opinion space, leading to large homogeneous groups for which the aforementioned procedure will be applied. The scheme is illustrated in examples motivated from environmental economics.