http://www.ats.ucla.edu/stat/spss/paperexamples/singer/default.htm

by the UCLA. This page contains data files and SPSS syntax to reproduced the analysis done in the paper "Using SAS Proc Mixed to Fit Multilevel Models, Hierarchical Models, and Individual Growth Models by Judith Singer. The original paper is available for download.

Link added: Jan. 13, 2003