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You can compare forecasting methods by one of these methods:

1- MAD(mean absolute deviation)

2-MSE (mean square error)

3-MAPE(mean absolute percentage error)

Notes:

1-MAD is the preferred method since it does not require squaring the errors and this is the only difference between MAD and MSE .

2-If you want to relate the error relative to the actual demand use MAPE

that is because in MAPE you will divide the error by the actual demand.

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