(See Exercise 60 regarding the data, and Exercise 61 for the Sharpe ratio.)
(a) Find the Sharpe ratio of stock in these three companies. Which looks best from this investment point of view?
(b) Form a new column by subtracting rf from the return each month on Exxon. Next divide this column of differences by the SD for Exxon. What is the mean value for this column?
(c) Look at the returns for December 2005. Do the returns in this month match up to the performance suggested by the Sharpe ratio? Explain briefly what happens.

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