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    Average Forecast Error

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    I am having a hard time calculating the average forecast error for september using a four period moving average.

    Month actual demand forecast demand Avg forecast error
    march 20
    April 25
    May 40
    June 35
    July 30 30
    Aug 45 32.5
    Sept 37.5

    How do I determine sept demand to get the avg forecast error or do I need it?

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    Using four period moving average, demand forecast for Sept is (May ...

    Solution Summary

    The solution shows calculation of the average forecast error for September using a four period moving average.