Plan vs actual (holdout weeks)
Weekly units · system plan (trail-28) vs actual sales · optional YoY blend shown dashed
Method bake-off
Weekly WMAPE on the holdout · lower is better · trail-28 won
Simulated cover (last week)
Item share by weeks of supply · bars past 4 weeks = over a month of stock (13.8%)
Largest plan misses
Top 8 exceptions · weekly WMAPE · plain English labels
Scenario · FOODS +10% Mother’s Day lift
Holdout window · check whether simulated cover can take the lift before you buy
+7,394 unitsextra demand
~$15k~$14,819 exact
If FOODS sells 10% hotter over the holdout, that is about 7.4k extra units (~$15k).