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Can anyone provide a decent sized data set and do a MAPE and WMAPE calculation with explanations please?

Has anyone reduced your company's number of DCs or a client's? If so, how did you calculate the impact of safety stock and inventory dollars?  My thought is to use the SS formula that includes zscore, replenishment lead-time, RSME and average demand. I would combine the data into the "new" DCs and simply run the calculation.  Am I missing anything?