模糊选择函数半序合理的充分条件

在G?del t-模下,研究了模糊选择函数的半序合理性.首先给出了模糊选择函数的合理性条件FA1.然后研究了该条件与模糊选择函数半序合理性之间的关系,得到了半序合理的一个充分条件.     

模糊选择函数的Wφ-伪传递及Wφ-半序合理性刻画

在模糊偏好结构下,首先将Schwartz提出的收缩扩张公理模糊化,在选择集为正规模糊集的前提下,研究模糊选择函数Wφ-伪传递及Wφ半序合理的刻画问题。由于模糊化后的条件不再是选择函数伪传递合理的充分条件,因此,文章最后给出新的条件来刻画其合理性。     

模糊选择函数的Wψ-伪传递及Wψ-半序合理性刻画

在模糊偏好结构下,首先将Schwartz[1]提出的收缩扩张公理模糊化,在选择集为正规模糊集的前提下,研究模糊选择函数Wψ伪传递及Wψ半序合理的刻画问题.由于模糊化后的条件不再是选择函数伪传递合理的充分条件,因此,文章最后给出新的条件束刻画其合理性.     

群体决策中Suzumura一致性选择函数理性化的充要条件

研究了Suzumura一致性选择函数的展示偏好描述,在已有的展示偏好定义基础上,给出了Suzumura一致性选择函数的展示偏好公理,并证明了该公理是Suzumura一致性选择函数理性化的充要条件.     

一个基于模糊偏好的选择函数

研究了一个基于模糊偏好关系的模糊选择函数。首先对文献中基于普通关系的最好元集所确定的选择函数进行了回顾,并给出了进一步结果。然后,讨论了该选择函数的模糊化形式,给出了基于模糊偏好的选择集确定模糊选择函数的充要条件,同时研究了该选择函数的合理性性质。     

Georgescu模糊选择函数伪传递合理性的研究

本文研究模糊选择函数伪传递合理性。对普通选择函数伪传递合理的两个充要条件进行了模糊化,讨论了它们的独立性;证明了对Georgescu模糊选择函数而言,这两个条件仍是伪传递合理的充分条件,但不再是必要条件。     

不完备偏好扩展式博弈的序贯均衡

将Kreps和Wilson提出的序贯均衡解概念推广到了存在不完备偏好的情形.首先给出了一个修正的颤抖手完美均衡的概念,然后应用它去证明不完备偏好扩展式博弈序贯均衡的存在性.     

模糊选择函数T-拟传递合理性充要条件的研究

T-拟传递合理性对模糊选择函数的研究至关重要.基于选择集为正规模糊选择集,对任意的t-模,利用文献中已有的结论,深入研究了模糊选择函数T-拟传递合理性的刻画问题,得到了模糊选择函数T-拟传递合理性的充要条件.     

普通选择函数的若干合理性条件的模糊化研究

以普通选择函数的有关结论为基础,利用模糊逻辑联结运算模糊化了Arrow的五个合理性条件,讨论了模糊化后的这些合理性条件之间的关系,研究了文献中给出的一个开问题,并对模糊情形下不成立的情况提供反例予以说明,从而推广了普通选择函数的相关结论。     

模糊选择函数中一些显示偏好关系的研究

对普通选择函数所导出的偏好关系R*,R,R,■及其之间的联系进行了讨论,并以此为基础,深入研究了模糊情况下对应的偏好关系及其之间的联系,给出了它们相等的一些充要条件。     

A lemma in open sequential voting by veto

The paper is devoted to the investigation of intuitively rational choice in a hierarchical game that is a model of election by open sequential veto-voting. Casting a veto against voter’s least preferred alternative (among remaining ones) may not lead to a sophisticated equilibrium. It means that sincere choice (being intuitive) is not rational. There arises the problem of finding conditions under which a sophisticated optimal sequence of actions is intuitively rational. We prove that in the case of strict preference ordering of alternatives, there exists an intuitively rational sophisticated optimal sequence. In the sequence, each voter vetoes an alternative less preferred than the sophisticated equilibrium outcome. Thus, only intuitively rational strategies are to be considered, although complete information about voters’ preferences is still needed.     

模糊选择函数的合理性及拟传递合理性的刻画

首先给出模糊选择函数合理性的一个充分必要条件。然后将普通情况下Schw artz所提出的收缩扩张公理模糊化,在选择集为正规模糊集的前提下,研究了模糊选择函数拟传递合理性的刻画问题。我们指出,该模糊化后的条件仍是选择函数拟传递合理的必要条件,但已不再是拟传递合理的充分条件(我们用例子说明了这一点)。因此,在文章的最后,给出了比较强的一个充分条件。     

Fuzzy relations for the analysis of traders’ preferences in an information market game

In this paper we focus on preference and decision data gathered during a computer-supported information market game in which 35 students participated during seven consecutive trading sessions. The participants’ individual preferences on the market shares are collected to calculate a collective preference ranking using the Borda social choice method. Comparing this preference ranking to the shares’ actual market ranking resulting from the participants’ trading, we find a statistically significant difference between both rankings. As the preferences established by market behavior cannot be adequately explained through a social choice rule, we propose an alternative explanation based on the herd behavior phenomenon where traders imitate the most successful trader in the market. Using a decision analysis technique based on fuzzy relations, we study the participants’ rankings of the best share in the market during 7 weeks and compare the most successful trader to the other traders. The results from our analysis show that a substantial number of traders is indeed following the market leader.     

基于模糊近容度的战时物资供应偏好选址

提出一种基于模糊近容度的战时物资供应的偏好选址方法,认为选址方案的确立是一个模糊多属性决策过程,而且这些属性在决策中具有主观偏好性,决策表是在原始模糊条件属性表的基础上,根据模糊粗糙隶属度和近似精度约简得到。选址方案的排序由模糊近容度生成。最后说明此方法在应用上的合理性和有效性。     

Utility Representations of Preferences on General Choice Spaces

The purpose of this paper is to reconsider the utility representation problem of preferences. Several representation theorems are obtained on general choice spaces. Preferences having continuous utility functions are characterized by their continuities and countable satiation. It is showed that on a pairwise separable choice space,the sufficient and necessary condition for a preference to be represented by a continuous utility function is that the preference is continuous and countably satiable. For monotone preferences,we obtain that any space has continuous utility representations.     

Sequential rationalization of multivalued choice

This paper contributes to the theory of rational choice under sequential criteria. Following the approach initiated by Manzini and Mariotti (2007) for single-valued choice functions, we characterize choice correspondences that are rational by two sequential criteria under a mild consistency axiom. Rationales ensuring the sequential rationalization are explicitly constructed and a uniquely determined, canonical solution is provided.