Estimate lift with a simple holdout

The team needs to handle an always-on retargeting program that may be overcredited without turning the report into noise. Use incrementality holdout design as a repeatable sequence: define the decision, choose the behavior signal, compare against a guardrail, and write the action threshold. The common trap is optimizing the easiest visible number and discovering later that it did not improve customer or business value. Step 1 Write the decision in one sentence. A metric cannot be relevant until the decision is explicit. Step 2 Choose the closest observable customer behavior. Prefer behavior over attitude when the action is operational. Step…

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