Linking Platform Investment to Business Outcomes
A fictional grocer spent 9.6 million on a data platform while revenue grew 14%. Estimate what the platform added, separate early signs from results, and decide under uncertainty.
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Log Compaction
Time-based retention forgets by age; compaction forgets by key. One keeps a recent window of events, the other keeps the latest value for everything.
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Retention
Retention depends on the starting population, return event and time window. Revenue can grow even while the number of retained customers falls.
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Cohort
An aggregate metric mixes behavior with composition. Cohorts hold the entry period fixed so the two can be told apart.
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Segment Action
Learn why a segmentation pays off only when each actionable group gets a purposeful response, and which two groups look identical but are not.
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RFM Analysis
Learn how RFM ranks customers using only purchase behavior, what its core assumption is, and where that assumption stops holding.
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Time Travel
Learn how a warehouse keeps prior versions queryable for a retention window, what that recovers, and why longer retention shows up as storage cost.