Forecasting Blog

My MAPE is begative

Help my MAPE is negative!

I have heard frequently calls for help saying MAPE is high or other complaints saying MAPE is unreliable. Recently we encountered two situations where the calculated MAPE and even the WMAPE were negative. When...

bullwhip-effect

Bull-whipping or driving the Demand?

  Bullwhip effect is a phenomenon of demand being overestimated or underestimated as it passes through various stages of supply chain resulting in exaggerated supply fluctuations. The increased variability in demand at successive stages...