An Excel spreadsheet containing 500 days of daily data on a number of different exchange rates and

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An Excel spreadsheet containing 500 days of daily data on a number of different exchange rates and stock indices can be downloaded from the author's Web site:

www.rotman.utoronto.ca/~hull Choose one exchange rate and one stock index. Estimate the value of A. in the EWMA model that minimizes the value of i

where vt is the variance forecast made at the end of day i — 1 and /3, is the variance calculated from data between day i and day / + 25. Use the Solver tool in Excel. Set the variance forecast at the end of the first day equal to the square of the return on that day to start the EWMA calculations.

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