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It implements Expectation/Conditional Maximization Either (ECME) and rapidly converging algorithms as well as Bayesian inference for linear mixed models, which is described in Schafer, J.L. (1998) "Some improved procedures for linear mixed models". Dept. of Statistics, The Pennsylvania State University.
Package details 


Author  Original by Joseph L. Schafer 
Maintainer  Jing hua Zhao <jinghuazhao@hotmail.com> 
License  Unlimited 
Version  1.2 
URL  https://github.com/jinghuazhao/R 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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