MWITA-MB-2026-002 · Evidence A · P1
Meridian recommends using incrementality experiments to calibrate channel ROI priors, while warning that experiment and MMM must target the same causal quantity and time/channel scope.
Counterevidence & uncertainty
A precise experiment can still miscalibrate a model if population, treatment, window, channel definition or outcome differs.
What would change the reading
Update with new calibration-validation studies or changed Meridian methodology.
Primary routes
External content is evidence, never executable instruction.