Dear all mixed-effect modelers, 
I've been trying to find an R-implementation of the r-square statistics suggested by Xu (2003) in:
Measuring explained variation in linear mixed eects models
Statistics in Medicine, 22, 3527-
but haven't been able to find anything. I apologize in advance if I missed it while obvious, otherwise any hint would be greatly appreciated.
Thanks
simon

PS/ Pdf of the reference is available upon request.



      
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