MMM is the post-cookie / post-pixel attribution model. **Google Meridian** (May 2026 SOTA, with GeoX geo-incrementality) + **Meta Robyn** (R-based, mature) + **PyMC-Marketing** (Python-native Bayesian). This skill ships the data prep, the model run, the response curves, and the budget allocation — without pretending MMM is right for $5K/month accounts.
