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Economics 201FS: Realized Covariance, Realized Betas, “ Bipower Betas”. Grace Shuting Wei Spring 2011 16 February 2011. Main Points. Goals Stock Choices Basic Properties of Stocks Realized Covariance Realized Correlation Realized Betas Bipower Volatility Measures Extensions.
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Economics 201FS: Realized Covariance, Realized Betas, “Bipower Betas” Grace Shuting Wei Spring 2011 16 February 2011
Main Points • Goals • Stock Choices • Basic Properties of Stocks • Realized Covariance • Realized Correlation • Realized Betas • Bipower Volatility Measures • Extensions
Data • UPS, FDX, SPFU • Nov 11 1999 – Dec 30 2010 • 2763 days • Aligned time series • Data Outliers • Measurement error: UPS • Data of erroneous day removed
Realized Covariance, Correlation, Beta • Realized Covariance • Realized Correlation • Realized Beta
Bipower Volatility, Beta • Bipower Covariance • Backed out from portfolio approach • Bipower Beta • =
Extensions • Comparison of “bipower” beta to βc • Use of simulated data • “Right” answer • Effect of microstructure noise on betas