Frieden is best known for his extensive work on Fisher information as a grounding principle for deriving and elaborating physical theory.
The Fisher information was discussed by several early statisticians, notably F. Y. Edgeworth.
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The role of the Fisher information in the asymptotic theory of maximum-likelihood estimation was emphasized by the statistician R.A. Fisher (following some initial results by F. Y. Edgeworth).
where is the Fisher information matrix.
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