Paid CAC (Customer Acquisition Cost)
A normal-approximation power calculation gives about 0.83 power for a user-level holdout with 5,000 users in each group; a geographic design needs cluster-level planning.
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Channel-Specific CAC (Customer Acquisition Cost)
Platform-claimed conversions total 3,130 against 1,700 real customers, so every channel CAC undercuts the blended one.
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Campaign Taxonomy
Map scoped campaign IDs to consistent reporting categories, preserve unmapped spend, and version classifications without confusing names with identity.
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Attribution Lookback Window
Define which past touches qualify for a conversion, specify exact boundaries, and separate attribution eligibility from ingestion and observation windows.
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Marketing Attribution
Assign conversion credit with an explicit rule, preserve unattributed outcomes, and distinguish reporting credit from incremental advertising effects.