(Answered) American Express stock: Mean absolute deviation (MAD)

See attached data file.;Reference Web site: Mathworld. http://mathworld.wolfram.com/MeanAbsoluteDeviation.html;To determine how well the spans (3 days or 10 days) each forecast the known observations, compute the MAD (mean absolute deviation) for each forecast, see the website referenced above for the MAD formula.;The file P13_16.xlsx contains the daily closing prices of American Express stock for a 1-year period.;a. Using a span of 3 days, forecast the price of this stock for the next trading day with the moving average;method. How well does this method with span 3 forecast the known observations in this data set?;b. Repeat part a with a span of 10.;c. Which of these two spans appears to be more appropriate? Explain your choice.;Attachments;P13_16.xlsx
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American Express stock: Mean absolute deviation (MAD)

 


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