The linear shrinkage estimator of the population covariance matrix is computed by shrinking the sample covariance matrix towards the identity matrix based on a shrinkage factor. Note that the eigenvalues of the population covariance matrix estimate are not the same as the linear shrinkage estimates of population eigenvalues. Details in referenced publication.
linshrink_cov(X, k = 0)
A data matrix.
(Optional) Non-negative integer less than
Population covariance matrix estimate. A square positive
semi-definite matrix of dimension
Ledoit, O. and Wolf, M. (2004). A well-conditioned estimator for large-dimensional covariance matrices. Journal of Multivariate Analysis, 88(2)