A rotation-equivariant estimator keeps the sample eigenvectors and changes only the eigenvalues: . Nonlinear shrinkage chooses each separately, as an estimate of the oracle value , the true variance of the -th sample eigenportfolio.
Quantitative Finance · शब्दावली
Rotation-equivariant estimator, nonlinear shrinkage क्या है?
अन्य नाम: rotation-equivariant estimator · nonlinear shrinkage