MSE
The Mean Squared Error, calculated as ([Σ N observations ((Demand of X periods - Forecast of X periods) ^ 2)] / N ) / X
* 
Each demand or forecast record is formed by aggregating data of x forward-looking periods:
For PAI Foundation dashboards, the forecast metrics are calculated using x = 1 slice
For PAI Advanced dashboards, the forecast metrics are calculated using x = Lead Time, x = 3, or x = 6 slices
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