Use model disagreement to choose the next measurement test
Ben Vigneron explains how to compare several marketing mix models using the same spend, outcome and control data. Differences in channel estimates can reveal the assumptions that matter most for a budget decision. He recommends resolving consequential disagreement with a focused incrementality test. The numerical comparison and branded-search holdout in the article are synthetic examples, not observed client results; agreement between models using shared data is not a causal test.
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