Skewness and the Relation Between Risk and Return
研究发现，投资组合超额收益的负偏度以及基于对称对数似然设定的估计方法，是导致风险收益关系实证结果矛盾的原因。
The relationship between risk and return has been one of the most important and extensively investigated issues in the financial economics literature. The theoretical results predict a positive relation between the two. Nevertheless, the empirical findings so far have been contradictory. Evidence presented in this paper shows that these contradictions are the result of negative skewness in the distribution of portfolio excess return and the fact that the estimation of intertemporal asset pricing models are based on symmetric log-likelihood specifications. Data, as supplemental material, are available at http://dx.doi.org/10.1287/mnsc.2015.2201 . This paper was accepted by Jerome Detemple, finance.