Learning under Ambiguity - A Note on the Belief Dynamics of Epstein and Schneider (2007)

Learning under Ambiguity - A Note on the Belief Dynamics of Epstein and Schneider (2007)
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歧义下的学习——关于爱泼斯坦和施耐德信念动态的注解 (2007)

DOI:
10.11588/heidok.00017512
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发表时间:
2007
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Epstein 和 Schneider (2007) 开发了一个模糊学习框架,将 Gilboa 和 Schmeidler (1989) 的 maxmin 偏好推广到跨期环境。 Epstein 和 Schneider (2007) 的特定信念动态依赖于对初始先验的拒绝,而这些先验在学习过程中已变得难以置信。我证明,这种事后拒绝理论的特征导致了与模糊厌恶形成鲜明对比的选择。具体而言,在普遍情况下,具有这种信念动态的跨期最大最小决策者更喜欢在模糊的瓮中下注,而不是在有风险的瓮中下注。我提供了他们框架的两个修改,每个修改都能够避免这种异常情况。
Epstein and Schneider (2007) develop a framework of learning under ambiguity, generalizing maxmin preferences of Gilboa and Schmeidler (1989) to intertemporal settings. The specific belief dynamics in Epstein and Schneider (2007) rely on the rejection of initial priors that have become implausible over the learning process. I demonstrate that this feature of ex-post rejection of theories gives rise to choices that are in sharp contradiction with ambiguity aversion. Concrete, the intertemporal maxmin decision-maker equipped with such belief dynamics prefers, under prevalent conditions, a bet in an ambiguous urn over the same bet in a risky urn. I offer two modifications of their framework, each of which is capable of avoiding this anomaly.
DOI: --
发表时间: 2011
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作者:
S. Condie;Jayant V. Ganguli
通讯作者: Jayant V. Ganguli