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Tim S. Campbell 《The Journal of Finance》1978,33(1):231-244
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This study empirically assesses the relative impact of business education on students' ethics while accounting for the potentially confounding effects of maturation and starting position. It finds that business education does not negatively effect the ethical development of students relative to the effect caused by non-business education. 相似文献
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This paper examines the stock market performance of a large sample of new issues (IPOs and SEOs) following an extreme price movement during the first three years after the offering. Strong underperformance follows either a positive or negative (at least +/?15%) one‐day return event. This poor performance cannot be explained by the Fama‐French four‐factor methodology, or by the generally low stock returns of growth firms. Unlike recent issuers, non‐issuers report no poor performance following a similar extreme event using the four‐factor methodology. The extreme event date shows very high levels of turnover, a measure of divergence of opinion. Finally, there is a strong negative linkage between higher levels of divergence of opinion and subsequent stock performance. 相似文献
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A discrete-time model for daily S & P500 returns and realized variations: Jumps and leverage effects
Tim Bollerslev Uta Kretschmer Christian Pigorsch George Tauchen 《Journal of econometrics》2009,150(2):151-166
We develop an empirically highly accurate discrete-time daily stochastic volatility model that explicitly distinguishes between the jump and continuous-time components of price movements using nonparametric realized variation and Bipower variation measures constructed from high-frequency intraday data. The model setup allows us to directly assess the structural inter-dependencies among the shocks to returns and the two different volatility components. The model estimates suggest that the leverage effect, or asymmetry between returns and volatility, works primarily through the continuous volatility component. The excellent fit of the model makes it an ideal candidate for an easy-to-implement auxiliary model in the context of indirect estimation of empirically more realistic continuous-time jump diffusion and Lévy-driven stochastic volatility models, effectively incorporating the interdaily dependencies inherent in the high-frequency intraday data. 相似文献