GNU R multiple imputation for multivariate panel or clustered data

 It provides functions and examples for maximum likelihood estimation for
 generalized linear mixed models and Gibbs sampler for multivariate linear
 mixed models with incomplete data, as described in Schafer JL (1997)
 "Imputation of missing covariates under a multivariate linear mixed model".
 Technical report 97-04, Dept. of Statistics, The Pennsylvania State University.