Produce a Stakeholder Summary

Lead with the decision and its conditions. A compact summary should include:

• treated geography, outcome, launch, cooldown, and measurement dates;
• eligible donor universe and material exclusions;
• design-stage MDE at the stated target power and plausible lift range;
• inference status, ATT in outcome units, interval, p-value, and placebo count;
• pre-period fit and donor concentration;
• concurrent media, spillover, data, and sensitivity caveats;
• a clear recommendation: proceed, interpret cautiously, redesign, or reject.

Example:

GeoSC estimated average incremental revenue of £X per week against the pre-specified SparseSC counterfactual over dates A–B. The two-sided in-space placebo p-value was P using N placebo assignments; the interval was [L, U]. Interpretation is conditional on the recorded donor-eligibility and treatment- isolation assumptions. The design-stage grid-based MDE was M% at T% target power, so effects below M% were not reliably detectable under the fitted DGP.

Do not translate statistical significance into ROI without campaign cost and a commercial value definition. Do not describe status: ok as proof of causal validity.