This review is based on SPSS version 12.0. The three SPSS commands of interest for multilevel modelling are all contained in the Advanced Models module, these being MIXED and VARCOMP. (An additional procedure GLM fits repeated measures models; however, random effects cannot be included in repeated measures designs in version 12.0.) The Advanced Models add capability to the SPSS Base system to conduct a range of additional analyses including generalised linear models and Cox regression; they complement the capabilities of the popular SPSS Base system. A major statistical package, SPSS is available in several languages. Most commands are available either through the graphical user interface or through the use of command syntax.
SPSS website: www.spss.com
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