VetResearchLMM: Linear Mixed Models- An Introduction with Applications in Veterinary Research.

Yaseen, M., Duchateau, L., Janssen, P., and Rowlands, J.
(2017) The Comprehensive R Archive Network (CRAN)

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R Codes and Datasets for Duchateau, L. and Janssen, P. and Rowlands, G. J. (1998). Linear Mixed Models. An Introduction with applications in Veterinary Research. International Livestock Research Institute.