Use the monthly data (September 2013 - November 2014) provided on the closing pr

Question

Use the monthly data (September 2013 - November 2014) provided on the closing prices for Gold (GLD), NASDAQ, Oil (USO) and Facebook (FB). Date GLD NASDAQ USO FB Sep-13 128 3771 37 50 Oct-13 128 3920 35 50 Nov-13 121 4060 33 47 Dec-13 116 4177 35 55 Jan-14 120 4104 35 63 Feb-14 128 4308 37 68 Mar-14 124 4199 37 60 Apr-14 124 4115 36 60 May-14 120 4243 38 63 Jun-14 128 4408 39 67 Jul-14 123 4370 36 73 Aug-14 124 4580 36 75 Sep-14 116 4493 34 79 Oct-14 113 4631 31 75 Nov-14 115 4713 29 74 What is the approximate value of mean absolute error (MAE) of forecasting based on 5 days moving average for GLD prices? 4.10 5.89 4.56 6.08

Explanation / Answer

Mean Absolute Error of GLD = 4.10

At Ft et = |At-Ft| 128 128 121 116 120 128 122.6 5.4 124 122.6 1.4 124 121.8 2.2 120 122.4 2.4 128 123.2 4.8 123 124.8 1.8 124 123.8 0.2 116 123.8 7.8 113 122.2 9.2 115 120.8 5.8 Average 4.10 MAE = 4.10

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