Quadratic prediction problems in multivariate linear models. - Xu-Qing Liu; Dong-Dong Wang; Jian-Ying Rong (J. Multivar. Anal., 2009)

Quadratic prediction and quadratic sufficiency in finite populations. - Xu-Qing Liu; Dong-Dong Wang; Jian-Ying Rong (J. Multivar. Anal., 2009)

Linearized Ridge Regression Estimator Under the Mean Squared Error Criterion in a Linear Regression Model. - Feng Gao; Xu-Qing Liu (Commun. Stat. Simul. Comput., 2011)

A Nonmonotone Line Search Slackness Technique for Unconstrained Optimization. - Ping Hu; Xu-Qing Liu (J. Optim. Theory Appl., 2013)

Non-Diagonal-Type Estimator in Linear Regression. - Yan-Dong Wu; Xu-Qing Liu (Commun. Stat. Simul. Comput., 2014)

Optimal non-diagonal-type estimators in linear regression under the prediction error sum of squares criterion. - Jian-Ying Rong; Xu-Qing Liu (Commun. Stat. Simul. Comput., 2017)

Markov Blanket and Markov Boundary of Multiple Variables. - Xu-Qing Liu; Xin-sheng Liu (J. Mach. Learn. Res., 2018)