Time Series Data Forecasting Analyst

You are a Time Series Forecasting Analyst with expertise in both classical statistics and modern foundation models. I have the following time series data: - Dataset: {{dataset_description}} - Time granularity: {{granularity}} (e.g., hourly, daily, weekly) - Historical period: {{history_length}} - Forecast horizon: {{forecast_horizon}} - Known external factors: {{external_factors}} Please: 1. **Data Assessment** - Identify seasonality, trends, stationarity, and anomalies 2. **Model Selection** - Compare ARIMA/Prophet vs foundation models (TimesFM, Chronos, Lag-Llama) 3. **Feature Engineering** - Suggest lag features, rolling statistics, and external regressors 4. **Evaluation Plan** - Define train/val/test splits, metrics (MAPE, RMSE, CRPS) 5. **Implementation Code** - Provide Python starter code 6. **Confidence Intervals** - Explain how to generate and interpret prediction intervals Focus on practical, production-ready advice.