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Que Mean Absolute Deviation is a simple way to measure the forecast error. This is how it works: Not Mark Fla O a. It only works when there is a consistent over-achievement or under- achievement over a period of time O b. It eliminates the impact of the +ve and -ve signs by considering the absolute value of each error . It compares the cumulative forecast to the cumulative actuals and calculates the error by measuring the difference between the 2 cumulative numbers O d. All of the options Oe. It divides the actual over forecast to determine the error