ESTIMATION OF TIME-VARYING COVARIANCE MATRICES FOR LARGE DATASETS
大规模数据的时变协方差矩阵估计
Time variation is a fundamental problem in statistical and econometric analysis of macroeconomic and financial data. Recently, there has been considerable focus on developing econometric modelling that enables stochastic structural change in model parameters and on model estimation by Bayesian or nonparametric kernel methods. In the context of the estimation of covariance matrices of large dimensional panels, such data requires taking into account time variation, possible…