The mean absolute percentage error (MAPE) is a statistical measure of how accurate a forecast system is. It measures this accuracy as a percentage, and can be calculated as the average absolute percent error for each time period minus actual values divided by actual values. Where At is the actual value and Ft is the forecast value, this is given by:
Stephanie Glen. "Mean absolute percentage error (MAPE)" From StatisticsHowTo.com: Elementary Statistics for the rest of us! https://www.statisticshowto.com/mean-absolute-percentage-error-mape/
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