Why accuracy is rarely the whole answer
Choosing evaluation metrics by starting with the decision, intervention capacity, and cost of error.
Field notes
Learning, tested in public.
Concise notes about the decisions behind data work—not only the final chart or model score.
SQL patterns I use in analytics work
A practical reference for retention cohorts, ranking, rolling metrics, and session boundaries.
What makes a RAG answer trustworthy?
A checklist for retrieval relevance, grounding, citation coverage, latency, and cost.