Practical insights
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Results
- Check sample ratio mismatch before reading any experiment metric
A 50/50 experiment shows 100,000 users in control and 98,500 in treatment, and the readout meeting is about to start.
easydocumented fact - Pair every target metric with a counter-metric that exposes gaming
A team will be rewarded on one KPI, such as on-time departure rate, forecast MAPE or average handling time.
easypractitioner heuristic - State the base rate before quoting a detector's accuracy to stakeholders
A fraud or no-show alert is described as "95% accurate", and a manager plans staffing around its flags.
easyempirical finding