Aswath Damodaran – Session 7 (MBA): The Greeks are here.. Regression Betas

Aswath Damodaran – Session 7 (MBA): The Greeks are here.. Regression Betas


Published on Feb 24, 2016

Today’s class covered the conventional approach to estimating betas, which is to run a regression of returns on a stock against returns on the market index. We first covered the estimation choices: how far back in time to go (depends on how much your company has changed), what return interval to use (weekly or monthly are better than daily), what to include in returns (dividends and price appreciation) and the market index to use (broader and wider is better). We also looked at the three key pieces of output from the regression:
1. The intercept: This is a measure of how good or bad an investment your stock was during the period of your regression. To compute the measure correctly, you net out Rf(1-Beta) from the Intercept:
Jensen’s alpha = Intercept – Riskfree rate (1- Beta)
If this number is a positive (negative) number, your stock did better (worse) than expected, after adjusting for risk and market performance.
2. The slope: is the beta, albeit with standard error
3. The R squared: measures the proportion of the risk in your stock that is market risk, with the balance being firm specific/diversifiable risk.

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Please note that I do not read comments posted here, nor respond to messages here. I don't have the time. If you want my attention, you must seek it directly at my blog. Aswath Damodaran is the Kerschner Family Chair Professor of Finance at the Stern School of Business at New York University. He teaches the corporate finance and equity valuation courses in the MBA program. He received his MBA and Ph.D from the University of California at Los Angeles. His research interests lie in valuation, portfolio management and applied corporate finance. He has written three books on equity valuation (Damodaran on Valuation, Investment Valuation, The Dark Side of Valuation) and two on corporate finance (Corporate Finance: Theory and Practice, Applied Corporate Finance: A User’s Manual). He has co-edited a book on investment management with Peter Bernstein (Investment Management) and has a book on investment philosophies (Investment Philosophies). His newest book on portfolio management is titled Investment Fables and was released in 2004. His latest book is on the relationship between risk and value, and takes a big picture view of how businesses should deal with risk, and was published in 2007. He was a visiting lecturer at the University of California, Berkeley, from 1984 to 1986, where he received the Earl Cheit Outstanding Teaching Award in 1985. He has been at NYU since 1986, received the Stern School of Business Excellence in Teaching Award (awarded by the graduating class) in 1988, 1991, 1992, 1999, 2001, 2007, 2008 and 2009, and was the youngest winner of the University-wide Distinguished Teaching Award (in 1990). He was profiled in Business Week as one of the top twelve business school professors in the United States in 1994.