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A simpler and more elegant method to calculate MAPE across all the products forecasted is to divide the sum of the absolute deviations by the total sales of all products.
Experts suggest that research featuring multiple hypotheses tested under ideal conditions would be accurate indicators of the accuracy of forecasting methods..<ref>{{cite web|url= http://marketing.wharton.upenn.edu/ideas/pdf/Armstrong/FindingsfromEvidence-BasedForecasting.pdf | title = Findings from Evidence-based Forecasting:
Methods for Reducing Forecast Error | author = J. Scott Armstrong | journal = International Journal of Forecasting (forthcoming)}}</ref>
==Calculating forecast error==
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