missForest              Nonparametric Missing Value Imputation using
                        Random Forests (ranger or randomForest)
missForest-package      Nonparametric Missing Value Imputation using
                        Random Forest (ranger by default)
mixError                Compute Imputation Error for Mixed-type Data
nrmse                   Normalized root mean squared error
prodNA                  Introduce Missing Values Completely at Random
                        (MCAR)
varClass                Extract Variable Types from a Data Frame
