=E10.26. The choice of the smoothing constants, and , has a considerable effect on the accuracy of

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=E10.26. The choice of the smoothing constants, and , has a considerable effect on the accuracy of the forecasts obtained by using exponential smoothing with trend. For each of the following time series, set 0.2 and then compare MAD obtained with 0.1, 0.2, 0.3, 0.4, and 0.5. Begin with initial estimates of 50 for the average value and 2 for the trend.

a. 52, 55, 55, 58, 59, 63, 64, 66, 67, 72, 73, 74

b. 52, 55, 59, 61, 66, 69, 71, 72, 73, 74, 73, 74

c. 52, 53, 51, 50, 48, 47, 49, 52, 57, 62, 69, 74

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