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vocabulary term week 4 - Beta equation(security The market...

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Beta equation (security) The market beta of a security is determined as follows: Regress excess returns of stock y on excess returns of the market. The slope coefficient is beta. Define n as number of observation numbers. Beta = [(n) (sum of [xy]) ]-[ (sum of x) (sum of y)]/ [(n) (sum of [xx]) ]-[ (sum of x) (sum of x)] where: n = # of observations (usually 36 to 60 months) x = rate of return for the S&P 500 index y = rate of return for the security Related: Alpha Beta The measure of a fund's or a stock's risk in relation to the market or to an alternative benchmark . A beta of 1.5 means that a stock's excess return is expected to move 1.5 times the market excess returns. E.g., if market excess return is 10%, then we expect, on average, the stock return to be 15%. Beta is referred to as an index of the systematic risk due to general market conditions that cannot be diversified away S&P Rating Rating service provided by S&P that indicates the amount of risk involved with different securities . Systematic risk Also called undiversifiable risk
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