Testing the capital asset pricing model efficiently under elliptical symmetry: a semiparametric approach
椭圆对称下资本资产定价模型的有效检验:半参数方法AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接提出资本资产定价模型的半参数检验,并讨论 beta 与定价限制,属于资产定价。
椭圆对称下资本资产定价模型的有效检验:半参数方法AI 解读 ↓
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Abstract We develop new tests of the capital asset pricing model that take account of and are valid under the assumption that the distribution generating returns is elliptically symmetric; this assumption is necessary and sufficient for the validity of the CAPM. Our test is based on semiparametric efficient estimation procedures for a seemingly unrelated regression model where the multivariate error density is elliptically symmetric, but otherwise unrestricted. The elliptical symmetry assumption allows us to avoid the curse of dimensionality problem that typically arises in multivariate semiparametric estimation procedures, because the multivariate elliptically symmetric density function can be written as a function of a scalar transformation of the observed multivariate data. The elliptically symmetric family includes a number of thick‐tailed distributions and so is potentially relevant in financial applications. Our estimated betas are lower than the OLS estimates, and our parameter estimates are much less consistent with the CAPM restrictions than the corresponding OLS estimates. Copyright © 2002 John Wiley & Sons, Ltd.