AFM273 Chapter Notes - Chapter 11: Weighted Arithmetic Mean, Expected Return, Covariance

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We can describe a portfolio by its portfolio weights: how much of each investment makes up the portfolio. If xi is the weighted average of portfolio, then ri would be the weighted average of the realized returns: so the expected returns would be. Note: without trading, the weights will increase for stocks in the portfolio whose returns exceed the portfolios. Combining risks: by combining stocks into a portfolio we can diversify risk. This allows risk in a portfolio to be lower than individual stocks: amount of risk that is eliminated in a portfolio depends on the sensitivity of the stock"s price to common risk. If everything in the portfolio is related to a single sector, minimal risk is eliminated. If there is a great degree of diversification then more risk can be eliminated. Expected product of the deviations of2 returns from their means: formula for estimating covariance from historical data.

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