Marketing & measurement
Cohort
A group sharing a characteristic or starting condition, analysed together over time.
In everyday use
You compare readers who signed up in September with those who signed up in October.
What to keep in mind
Differences between cohorts may reflect season, acquisition source or other factors, rather than your latest change alone.
Also searched as: User cohort
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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