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Ch 10 revised

# Ch 10 revised - CHAPTER 10 INDEX MODELS 3 a The two figures...

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CHAPTER 10: INDEX MODELS 3. a. The two figures depict the stocks’ security characteristic lines (SCL). Stock A has a higher firm-specific risk because the deviations of the observations from the SCL are larger for Stock A than for Stock B. Deviations are measured by the vertical distance of each observation from the SCL. b. Beta is the slope of the SCL, which is the measure of systematic risk. The SCL for Stock B is steeper; hence Stock B’s systematic risk is greater. b. The R 2 (or squared correlation coefficient) of the SCL is the ratio of the explained variance of the stock’s return to total variance, and the total variance is the sum of the explained variance plus the unexplained variance (the stock’s residual variance). ) i 2 2 M 2 i 2 M 2 i 2 e ( R σ + σ β σ β = Since the explained variance for Stock B is greater than for Stock A (the explained variance is 2 M 2 B σ β , which is greater since its beta is higher), and its residual variance σ 2 (e B ) is smaller, its R 2 is higher than Stock A’s.

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Ch 10 revised - CHAPTER 10 INDEX MODELS 3 a The two figures...

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