Try this: http://www.ats.ucla.edu/stat/spss/topics/MLM.htm
The Singer article that they refer to is excellent. The article uses SAS, but the ATS staff have given the code to do it in SPSS. I don't know if it is as step-by-step as you need, but it's the best I know of.
Sorry, don't know anything in French.
Karen





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