Linear Mixed Model in SAS and R 以下链接有例子可让楼主参考。
http://r.789695.n4.nabble.com/mi ... and-R-td857820.html

有关Linear Mixed Model 或称 Hierarchical Level Regression Model，可使用以下软件的函数...
SAS (PROC MIXED), SPSS (Linear Mixed Models), Stata (xtmixed, available in Release 9), R (the lme() and gls() functions), and HLM (Hierarchical Linear Models).
http://www-personal.umich.edu/~bwest/almmussp.html

阅读完以下链接，相信楼主就会了解了...
http://www.indiana.edu/~statmath/stat/all/hlm/hlm.pdf
http://www.math.ttu.edu/~atrinda ... ndSAScomparison.pdf
http://cran.r-project.org/doc/co ... ix-mixed-models.pdf
http://www.nippondream.com/estatus/id38.html

非常感谢