AFM273 Lecture Notes - Lecture 11: Market Risk, Risk-Free Interest Rate, United States Treasury Security

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Determining covariance and correlation: covariance: expected product of the deviations of two returns from their means, when estimating the covariance from historical data, use this formula: If 2 stocks move together, their returns will tend to be above or below average at the same time and the covariance will be positive. Is the stocks move in opposite directions, one will go above average when the other is below average, so the covariance will be negative. Computing a portfolio"s variance and volatility: variance of a return is equal to the covariance of a return with itself, var(rp) = x1, var(rp) = x1. The portfolio will have the greatest variance if the stocks have a perfect positive correlation of +1. 101 stocks: almost all of the benefit of diversification can be achieved with about 30 stocks, but even with a large portfolio we can not eliminate all risk.

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