Return-User Signal Study

Retention charts move for reasons that have nothing to do with product quality: SDK upgrades, timezone mishandling, silent user-id changes, or onboarding renames that break day-one events.

This study rebuilds cohort definitions, checks identity continuity, and tests early-session behaviours against return rates—with explicit limits on what the sample can prove.

You leave with behaviours worth protecting, artefacts to stop treating as insights, and a cohort outline your analysts can maintain.