Study verifies the consistency of G55 and G59 estimators for quadratic forms in stochastic equations, highlighting their importance.
The consistency of the estimators <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:msub> <m:mi>G</m:mi> <m:mn>55</m:mn> </m:msub> </m:math> {G₅₅} and <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:msub> <m:mi>G</m:mi> <m:mn>59</m:mn> </m:msub> </m:math> {G₅₉} for quadratic forms of the regularized inverse covariance matrix is proven.
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Vyacheslav L. Girko (2026) studied this question.
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