Coffee break: imputation

From CranR:
Simple mean imputation: http://www.r-bloggers.com/example-2014-5-simple-mean-imputation/

knnImputation {DMwR} Function that fills in all NA values using the k Nearest Neighbours of each case with NA values.
centralImputation {DMwR} This function fills in any NA value in all columns of a data frame with the statistic of centrality (given by the function centralvalue()) of the respective column.

Other: kNNImpute {imputation} Imputation using k-nearest neighbors. For each record, identify missinng features. http://www.bioconductor.org/packages/release/bioc/html/impute.html
 impute {Hmisc} http://www.inside-r.org/packages/cran/hmisc/docs/impute http://www.jstatsoft.org/article/view/v023i10 http://docs.zeligproject.org/en/latest/using-Zelig-with-Amelia.html