All Articles & Tutorials
Explore practical guides, step-by-step masterclasses, and foundational definitions across AI, SQL, and data systems — written in plain, human English.
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Goodhart’s law: what happens when a metric becomes a target
Goodhart’s law: when a measure becomes a target, it stops being a good measure. Pair KPIs with incentives, audit gaming paths, and prefer metrics that are hard to…
How to add notes and callouts that make a chart’s point obvious
Treat titles, callouts, reference lines, a so-what line, and footnotes as part of the chart. Annotation turns a clean picture into a decision aid without lying.
Uncertainty and confidence intervals explained in plain English
Read point estimates with intervals. Confidence intervals show a range of plausible values under a model. Statistical significance is not business importance.
How to set data retention rules so you stop keeping data you don’t need
Treat retention as a keep, archive, or delete decision with owners and dates. Prefer delete, anonymize, or aggregate over forever. Legal holds are a different job from “we…
How to check an AI tool’s answers yourself before you trust it at work
Build human-sized evals: spot checks, golden questions, and a regression set with clear pass criteria. Score analytics outputs before fluent wrong SQL or prose becomes process.
