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Which Hedge Fund Managers Deliver in a Crisis? Assessing Performance When Returns are Skewed 哪些对冲基金经理能在危机中发挥作用?当回报倾斜时评估绩效
Pub Date : 2011-07-06 DOI: 10.2139/ssrn.1929107
Andrea Heuson
: 92 percent of hedge funds in the TASS database exhibit significantly skewed returns. The alphas the managers of these funds earn are difficult to estimate accurately with OLS, especially in times of crisis. An alternative, the Residual Augmented Least Squares (RALS) estimator, is robust with respect to skewness. We demonstrate that the OLS performance assessment error relative to RALS depends systematically upon the sign of skewness in a fund’s returns and is economically significant. Furthermore, portfolios formed on RALS alphas persist more than those formed on OLS alphas and the performance persistence is concentrated in crisis periods.
: TASS数据库中92%的对冲基金表现出明显的倾斜回报。这些基金经理的收益很难用OLS来准确估计,尤其是在危机时期。另一种方法是残差增广最小二乘(RALS)估计,它对偏度具有鲁棒性。我们证明了OLS绩效评估误差相对于RALS系统地依赖于基金回报的偏度符号,并且具有经济意义。此外,在RALS alpha上形成的投资组合比在OLS alpha上形成的投资组合更持久,并且业绩持久性集中在危机时期。
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引用次数: 6
Do the Diversification Choices of Individual Investors Influence Stock Returns? 个人投资者的多元化选择是否影响股票收益?
Pub Date : 2006-09-01 DOI: 10.2139/ssrn.664044
Alok Kumar
This paper shows that the diversification choices of individual investors influence stock returns. A zero-cost portfolio that takes a long (short) position in stocks with the least (most) diversified individual investor clientele generates an annual, risk-adjusted return of 5-9%. This spread reflects the combined effects of sentiment induced mispricing, narrow risk framing, and asymmetric information, where the sentiment effect is the strongest. Furthermore, the influence on returns is stronger among smaller, low institutionally owned, and hard-to-arbitrage stocks. These results are robust to concerns about relatively short sample size, improper factor model specification, slow information diffusion, and high transaction costs.
本文证明了个人投资者的多元化选择对股票收益的影响。拥有最少(最多)多样化个人投资者客户的股票多头(空头)零成本投资组合可产生5-9%的年度风险调整回报率。这种价差反映了情绪导致的错误定价、狭窄的风险框架和信息不对称的综合影响,其中情绪效应最强。此外,对收益的影响在规模较小、机构持股率较低、难以套利的股票中更强。这些结果对于相对较短的样本量、不适当的因素模型规范、缓慢的信息扩散和高交易成本的关注是稳健的。
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引用次数: 49
Do Investment-Based Models Explain Equity Returns? Evidence from Euler Equations 基于投资的模型能解释股票收益吗?欧拉方程的证据
Pub Date : 2005-09-09 DOI: 10.2139/ssrn.1786620
Stefanos Delikouras, Robert F. Dittmar
We investigate the empirical implications of the investment-based model of asset pricing for the Hansen-Jagannathan and Kozak-Nagel-Santosh discount factors in the linear span of equity returns. We find that the stochastic discount factors satisfying the Euler equation for equity returns cannot satisfy the Euler equation for investment returns because returns on corporate investment covary inversely with the sources of equity risk relative to returns on equity. As a result, the model fails to replicate the level of the risk premium. Our results suggest that joint restrictions on the optimality of investment and consumption pose stringent conditions for candidate production models.
我们研究了基于投资的资产定价模型对股票收益线性区间的Hansen-Jagannathan和Kozak-Nagel-Santosh折现因子的实证意义。我们发现满足股权收益欧拉方程的随机贴现因子不能满足投资收益欧拉方程,因为企业投资收益与股权风险来源相对于股权收益呈负相关。因此,该模型无法复制风险溢价的水平。我们的研究结果表明,投资和消费最优性的联合约束为候选生产模型提供了严格的条件。
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引用次数: 1
Does Industry-Level Analysis Improve Profitability and Growth Forecasts? 行业层面的分析能提高盈利能力和增长预测吗?
Pub Date : 2005-05-01 DOI: 10.2139/ssrn.589361
P. M. Fairfield, Sundaresh Ramnath, T. Yohn
A long history of economic theory suggests that industry membership plays an important role in explaining a firm's financial performance. In this paper we investigate the usefulness of industry benchmarks and industry level analysis for predicting a firm's future profitability and growth. Specifically we investigate whether incorporating the industry performance metric provides incremental information over the firm specific metric for explaining performance one-year-ahead. We also investigate the usefulness of performing industry level analysis relative to an analysis of all firms pooled across the economy. We find little or no incremental explanatory power from incorporating industry information for predicting future profitability, defined either as return on equity or return on net operating assets. Nor do we find industry information incrementally informative for predicting growth in net operating assets. We do, however, find significant improvement from incorporating industry information for predicting growth in sales. These general results hold for one-, three-, and five-year windows, and are robust to alternative industry classification schemes.
经济理论的悠久历史表明,行业成员资格在解释企业财务绩效方面起着重要作用。在本文中,我们研究了行业基准和行业水平分析对预测企业未来盈利能力和增长的有用性。具体来说,我们研究了合并行业绩效指标是否比公司特定指标提供了增量信息,以解释未来一年的业绩。我们还研究了执行行业水平分析相对于分析整个经济中汇集的所有公司的有用性。我们发现,结合行业信息预测未来盈利能力(定义为股本回报率或净经营资产回报率)的增量解释力很小或没有。我们也没有发现行业信息对于预测净经营资产的增长有增量的帮助。然而,我们确实发现通过整合行业信息来预测销售增长有了显著的改善。这些一般结果适用于1年、3年和5年的窗口,并且适用于其他行业分类方案。
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引用次数: 7
Dynamic Incentives and Responsibility Accounting 动态激励与责任会计
Pub Date : 1998-03-01 DOI: 10.2139/ssrn.74368
Raffi Indjejikian, D. Nanda
In dynamic principal-agent relationships, unless a principal can precommit to a multiperiod contract, incentives are affected by a problem known as the ratchet effect. We present a two period agency model to show that the use of more aggregate performance measures and greater consolidation of responsibility helps mitigate the ratchet effect. For example, an aggregate measure may be preferred to a set of disaggregate measures to avoid aggravating the ratchet effect. Similarly, it may be preferable to consolidate responsibility for two activities in the hands of one agent despite the potential loss of performance evaluation information implied by consolidation.
在动态委托代理关系中,除非委托人可以预先承诺多期合同,否则激励会受到棘轮效应的影响。我们提出了一个两期代理模型,以表明使用更多的综合绩效指标和更大的责任整合有助于减轻棘轮效应。例如,为了避免加重棘轮效应,一个聚合度量可能优于一组非聚合度量。同样,最好将两项活动的责任合并到一个代理的手中,尽管合并可能会导致业绩评价信息的损失。
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引用次数: 138
The Dow Theory: William Peter Hamilton's Track Record Re-Considered 道氏理论:重新考虑威廉·彼得·汉密尔顿的历史记录
Pub Date : 1998-01-23 DOI: 10.2139/ssrn.58690
Stephen J. Brown, W. Goetzmann, Alok Kumar
Alfred Cowles' (1934) test of the Dow Theory apparently provided strong evidence against the ability of Wall Street's most famous chartist to forecast the stock market. In this paper, we review Cowles' evidence and find that it supports the contrary conclusion -- that the Dow Theory, as applied by its major practitioner, William Peter Hamilton over the period 1902 to 1929, yielded positive risk-adjusted returns. A re-analysis of the Hamilton editorials suggests that his timing strategies yield high Sharpe ratios and positive alphas. Neural net modeling to replicate Hamilton's market calls provides interesting insight into the nature and content of the Dow Theory. This allows us to examine the properties of the Dow Theory itself out-of-sample.
阿尔弗雷德·考尔斯(Alfred Cowles, 1934)对道氏理论的检验显然提供了强有力的证据,证明这位华尔街最著名的图表专家预测股市的能力是错误的。在本文中,我们回顾了考尔斯的证据,发现它支持相反的结论——道氏理论,作为其主要实践者,威廉·彼得·汉密尔顿在1902年至1929年期间应用,产生了正的风险调整回报。对汉密尔顿社论的重新分析表明,他的时机策略产生了高夏普比率和正阿尔法。神经网络模型复制汉密尔顿的市场预测提供了有趣的洞察道氏理论的性质和内容。这使我们能够检查道氏理论本身样本外的性质。
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引用次数: 175
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University of Miami Herbert Business School Research Paper Series
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