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Multiple Metrics in Experiments

HardStatistics & Probability00:00
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Problem

Scenario

You're reviewing an experiment on a social product with several success metrics and guardrails. The team is debating how to interpret mixed results across primary, secondary, and diagnostic metrics, and how to control false positives when many comparisons are made.

Question

How would you think about multiple metrics and multiple comparisons in an experiment?

Meta Context

  • Think in terms of AARRR and product metric hierarchies, not a flat list of KPIs
  • Representative metrics: Reels 7-day retention, IG Save rate, k-factor, negative feedback, crash rate
  • Relevant pitfalls: SRM, novelty effect, and over-reading secondary metrics
  • CUPED may improve precision using pre-experiment behavior, but it does not solve multiplicity