参考文献

• R Development Core Team. (2005). R: A language and environment for statistical computing. Vienna, Austria. (ISBN 3-900051-07-0)

• Raudenbush, S. W., & Bryk, A. S. (2002). Hierarchical linear models: Applications and data analysis methods (2nd ed.). Sage.

• Singer, J. D. (1998). Using SAS PROC MIXED to fit multilevel models, hierarchical models, and individual growth models. Journal of Educational and Behavioral Statistics, 24, 323-355.