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Lam, Clifford and Feng, Phoenix (2018) A nonparametric eigenvalue-regularized integrated covariance matrix estimator for asset return data. Journal of Econometrics, 206 (1). pp. 226-257. ISSN 0304-4076
Lam, Clifford, Feng, Phoenix and Hu, Charlie (2017) Nonlinear shrinkage estimation of large integrated covariance matrices. Biometrika, 104 (2). pp. 481-488. ISSN 0006-3444