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st: crossed 4-level linear analysis

From   "Hommes Juliette (EDUC)" <>
To   "''" <>
Subject   st: crossed 4-level linear analysis
Date   Tue, 12 Jul 2011 11:24:57 +0200


With great enthusiasm I've worked with STATA but now I've come across a problem that I cannot resolve so far. Therefore I hope you can give me a hand. 

I've collected repeated measurements (2) in two modules. Participants enrolled in the first module and were divided in groups randomly (n=30). After finishing the first module, the participants are again randomly assigned to groups (n=32). As such I've got four levels in my data structure with "crossed"data among the students/group levels: 1) Repeated measures, 2) Modules, 3) Students, 4) Groups. 

I've been using the xtmixed command, but I found that it could only be used for three levelled datasets (and/or crossed data). Do you have an idea to analyse the four levels in one model and account for the crossed nature of the data in STATA? 

Thank you very much for your help.

Maastricht University, The Netherlands

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