Cohort analysis for an onboarding change
WHAT IT TESTS: Cohort reasoning and clean framing. OUTLINE: A cohort groups users by a shared start trait; compare pre and post Jan-1 signup cohorts on retention by age. RED FLAG: Comparing calendar periods instead of cohort age, confounding seasonality.
WHAT IT TESTS: Whether you understand cohorts and can isolate an onboarding change's effect. ANSWER OUTLINE: A cohort is users sharing a defining event in a window, usually signup date. Define one cohort signing up before January 1 (old flow) and one after (new flow). Track retention by age (day 1, 7, 30) and a key activation metric, plotting curves aligned on days since signup, not calendar date. Watch for seasonality and selection confounds. RED FLAG: Comparing raw calendar-month totals, which mixes cohort ages and ignores seasonality.
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- #cohort-analysis
- #retention
- #onboarding
- #analytics
- #metrics
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