What Beta Means: Considering a Stock's Risk Investopedia. Beta is a measure of a stock's volatilityin relation to the overall market. By definition, the market, such as the S&P 500 Index, has a beta of 1.0, and individual stocks are ranked according to how much they deviate from the market. A stock that swings more than the market over time has a beta above 1.0. If a stock. See more
Web4 rows Stock "beta" is a statistical measure that compares the volatility.
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