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Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.| Investopedia
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Mean reversion is a financial theory positing that asset prices and historical returns eventually revert to their long-term mean or average level.| Investopedia
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The capital asset pricing model (CAPM) helps to calculate investment risk and what return on investment an investor should expect.| Investopedia