Compare a time-series forecast with a seasonal baseline
Build a previous-season reference, evaluate it on later observations and distinguish calendar alignment from leakage and missing data.
Time Series / Forecasting / Baseline / Validation
TECHNOLOGY / KNOWLEDGE / PRACTICE
AI, programming, SQL, Web and SAP: guides and tips
Materials on AI, Python, Git, SQL, Web/API, SAP/ERP, statistics and time series: explanations, examples, practical tips, sources and applicability limits.
Latest guides
49-51 / 51 materialsValidate a time-series forecast without leaking the future
Use chronological splits and fit preprocessing only on past data.
Python / Time series / Validation
curl works, fetch fails: diagnosing CORS and preflight
Distinguish response access from request sending, inspect an OPTIONS preflight and configure explicit origins for credentialed browser requests.
HTTP / CORS / fetch / API / Troubleshooting