Your question is Hierarchical Forecasting Across Regions. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you build a hierarchical time series forecasting approach across product lines and geographic regions at Amplify?
Describe the statistical structure, forecasting and reconciliation strategy, validation design, uncertainty estimates, and production considerations. The response should explain how forecasts at product-region, product-line, geographic, and total levels remain coherent without sacrificing local signal.
Provide the model equations, key assumptions, a practical implementation outline, and the diagnostics you would use to compare base forecasts with reconciled forecasts.