96 citations · 160 across the 5 of their papers we have counts for
5 papers
Exploring the relation between students' online learning behavior and course performance by including contextual information in data analysis
Zhongzhou Chen, Mengyu Xu, Geoffrey Garrido +1
This study examines whether including more contextual information in data analysis could improve our ability to identify the relation between students' online learning behavior and…
Estimation of dynamic networks for high-dimensional nonstationary time series
Mengyu Xu, Xiaohui Chen, Wei Biao Wu
This paper is concerned with the estimation of time-varying networks for high-dimensional nonstationary time series. Two types of dynamic behaviors are considered: structural break…
Regularized estimation of linear functionals of precision matrices for high-dimensional time series
Xiaohui Chen, Mengyu Xu, Wei Biao Wu
This paper studies a Dantzig-selector type regularized estimator for linear functionals of high-dimensional linear processes. Explicit rates of convergence of the proposed estimato…
Asymptotics for High-Dimensional Data
Mengyu Xu, Danna Zhang, Wei Biao Wu
We develop an asymptotic theory for norms of sample mean vectors of high-dimensional data. An invariance principle for the norms is derived under conditions that involv…
Covariance and precision matrix estimation for high-dimensional time series
Xiaohui Chen, Mengyu Xu, Wei Biao Wu
We consider estimation of covariance matrices and their inverses (a.k.a. precision matrices) for high-dimensional stationary and locally stationary time series. In the latter case…