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In observance of the 2024 holiday season, Sage offices will be closed Monday December 23rd through Wednesday January 1st. Normal operations, including shipping for orders placed during the closure, will resume on Thursday January 2nd. For technical support during this time, please visit our technical support page for assistance options. 

We wish you a wonderful holiday season. Thank you. 

Xing Liu Eastern Connecticut State University

Xing Liu Ph.D., is a professor of educational research and assessment at Eastern Connecticut State University. He received his Ph.D. in measurement, evaluation, and assessment in the field of educational psychology from the University of Connecticut, Storrs. His interests include categorical data analysis, multilevel modeling, longitudinal data analysis, structural equation modeling, educational assessment, propensity score methods, data science, and Bayesian methods. He is the author of Applied Ordinal Logistic Regression Using Stata: From Single-Level to Multilevel Modeling (2016). His major publications focus on advanced statistical models. His articles have been recognized among the most popular papers published in the Journal of Modern Applied Statistical Methods (JMASM). Dr. Liu is the recipient of the Excellence Award in Creativity/Scholarship at Eastern Connecticut State University.