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DATA-SCIENCE-FUNDAMENTALS5 MIN READ

Work Through a Cohort Retention Table

Compute a cohort retention table by defining cohort, activity window, denominator, numerator, and interpretation.

worked-trail before-after stat-tile-trio June active users fell from 18,400 to 14,900. Determine whether early retention worsened or the user base simply had fewer new signups. Cohort retention = retained users from the original cohort divided by the original cohort size at the same lifecycle age. Using total active users as the denominator mixes acquisition volume with retention behavior and can make a smaller signup month look like product decline. Define cohort Cohort = users whose first signup date falls in April, May, or June. The cohort definition fixes who belongs in each row. Without this, later activity months can pull…

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