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Generalized entropy and model uncertainty

机译:广义熵和模型不确定性

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I provide a model uncertainty foundation to the power certainty equivalent of Epstein-Zin-Weil risk sensitive preferences (EZ), enabling the analysis of these preferences using detection probabilities (DEPs) and worst case models. This completes the connection between these preferences and the model uncertainty of Hansen and Sargent (2007) (HS) that was previously limited to the special case of unit elasticity of intertemporal substitution. The connection between EZ and HS rests on a powerlike extension of entropy and its associated statistics from Tsallis (1988) and I show that the same additional margin of pessimism that implies this connection can close the gap to the empirical Sharpe ratio in a more general specification. For the specific cases of EZ and HS preferences, I find that calibrations that match detection error probabilities yield comparable asset pricing implications across models. Surprisingly, I find that the low levels of risk aversion with EZ preferences that match asset pricing facts are associated with a high level of model uncertainty in the long run risk environment of Barisal and Yaron (2004). (C) 2019 Elsevier Inc. All rights reserved.
机译:我提供了与Epstein-Zin-Weil风险敏感偏好(EZ)的幂确定性等效的模型不确定性基础,从而能够使用检测概率(DEP)和最坏情况模型对这些偏好进行分析。这就完成了这些偏好与Hansen和Sargent(2007)(HS)的模型不确定性之间的联系,后者以前仅限于跨期替代的单位弹性的特殊情况。 EZ和HS之间的联系基于熵的幂次扩展及其来自Tsallis(1988)的相关统计数据,我证明了悲观主义的相同附加裕度暗示着这种联系可以在更一般的规范中缩小与经验夏普比率的差距。 。对于EZ和HS偏好的特定情况,我发现与检测错误概率匹配的校准会在各个模型之间产生可比的资产定价含义。出乎意料的是,我发现在Barisal和Yaron(2004)的长期风险环境中,具有与资产定价事实相匹配的EZ偏好的低风险规避与较高的模型不确定性有关。 (C)2019 Elsevier Inc.保留所有权利。

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