references: A named vector. Identifies the references to be used for reference-based imputation methods. Should be of the form c("Group1" = "Reference1", "Group2" = "Reference2"). If NULL (default), the references are assumed to be of the form c("Group1" = "Group1", "Group2" = "Group2"). This argument cannot be NULL if an imputation strategy (as defined by data_ice[[vars$strategy]] in the call to draws ) other than MAR is set.
update_strategy: An optional data.frame. Updates the imputation method that was originally set via the data_ice option in draws(). See the details section for more information.
strategies: A named list of functions. Defines the imputation functions to be used. The names of the list should mirror the values specified in strategy column of data_ice. Default = getStrategies(). See getStrategies() for more details.
condmean: logical. If TRUE will impute using the conditional mean values, if values will impute by taking a random draw from the multivariate normal distribution.