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Alpha

Alpha is a measure of the active return on an investment, the performance of that investment compared to the S&P500 index, where 0.01 = 1%

alpha < 0: the investment has earned too little for its risk (or, was too risky for the return)
alpha = 0: the investment has earned a return adequate for the risk taken
alpha > 0: the investment has a return in excess of the reward for the assumed risk

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