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MRI
A diagnostic metric measuring how resistant an institution's core models are to revision. High MRI indicates that foundational assumptions remain unchanged despite contradictory evidence. Calculated by tracking model age, number of contradicting data points received, and number of model revisions.
A central bank's inflation model hasn't been revised in 15 years despite 200 months of prediction errors. MRI is extremely high—the model has become immune to evidence.
ILA-ALR Section 3.3