Calculate mean absolute deviation

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Assignment

Q1. The monthly sales for Telco Batteries, Inc., were as shown in the excel sheet. Please use 4-month weighted moving average method to forecast the demands from month 5 to month 19. The weight associated to last month's sales is 40%; the weight associated to the sales two months ago is 30%; the weight associated to the sales three months ago is 20%; the weight associated to the sales four months ago is 10%. Once you have the forecasted sales from month 5 to month 19, calculate the following measures of the forecast error.

a. Mean Absolute Deviation (MAD);

b. Mean Squared Error (MSE); and

c. Mean Absolute Percent Error (MAPE).

Q2. The AMC theatre in sunset plaza observes the daily tickets sales for the past four weeks. Please see the data in the excel sheet. The manager of the theatre has forecasted that next week's total ticket sale will be 2390. Based on this forecast and the seasonal index method, how many tickets will be sold on each day next week?

3. The excel file has a sheet that contains data for the past 30 weeks of sales for product X. Based on the data, answer the following questions

a. Plot the data. Just by looking at the plot (that is, without doing any calculation), do you think a 3-week simple moving average would be a better forecast, or a 6-week simple moving average? Just by looking at the plot, do you think an exponential smoothing with value of α = 0.2 would be better forecast or would α = 0.6 be better? Explain your reasoning. (Note: do the two comparisons separately; don't compare moving average with exponential smoothing)

b. Apply the four forecasts (3-week and 6-week simple moving average and exponential smoothing with value of α = 0.2 and α = 0.6), and plot the forecasted sales along with the actual sales you plotted in (a). For exponential smoothing, assume the forecast for the first week is 600.

c. For each of the above four forecasts, compute the MAD for forecasting before week 25. In addition, compute the MAD for the last five weeks. Compare those numbers to see if they confirm your answer to part (a).

4. Data on the bus and subway ridership for the summer months in London, England, have been recorded for the past 16 years. See excel file for the data sheet.

a. Please use trend projection method to forecast the ridership (how many) for the summer months in the year 17.

b. Now, the bus and subway ridership for the summer months is believed to be tied heavily to the number of tourists visiting the city. The excel data sheet also provides the data on the number of tourists. Please use linear regression model to forecast the ridership (how many) for the summer months in a year when the estimated number of tourists visiting is 18 millions.

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Reference no: EM131235424

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