Abstract
We construct an estimator of the unknown parameter vector of a system of linear equations minimizing the standard efficiency criterion. The proof is based on Rayleigh's formula and on the perturbation formulas for the eigenvalues of matrices. The estimator satisfies a certain functional equation and cannot be obtained in explicit form.
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Translated from Vychislitel'naya i Prikladnaya Matematika, No. 63, pp. 114–115, 1987.
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Girko, V.L. Spectral equations for minimax parameter estimators of linear systems. J Math Sci 66, 2221–2222 (1993). https://doi.org/10.1007/BF01098612
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DOI: https://doi.org/10.1007/BF01098612