Limits RegistryPUBLIC RECORDLimits RegistryResearch Console →Covariance of an unbiased estimator is bounded below by inverse Fisher information.
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Lower-bound covariance matrices of unbiased estimators under regular parametric likelihoods.
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Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
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Limits Registry. LR-003403. Cramér–Rao estimator-variance lower bound. 2026.