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If the actual value of a time series at time t and the forecast value...

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Basic Math

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If the actual value of a time series at time t and the forecast value for time t is denoted by At and Ft respectively then the formula for the mean absolute deviation over a range of forecasted values is O MAD MAD MAD MAD A Ft 2 t 1 72 72 A1 F f 1 72 72 A4 F t 1 72 AL F f 1

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