This helper function creates a valid
visitSequence is an argument to the
mice function that
specifies the sequence in which blocks are imputed.
A data frame or a matrix containing the incomplete data. Missing values are coded as
List of vectors with variable names per block. List elements may be named to identify blocks. Variables within a block are imputed by a multivariate imputation method (see
methodargument). By default each variable is placed into its own block, which is effectively fully conditional specification (FCS) by univariate models (variable-by-variable imputation). Only variables whose names appear in
blocksare imputed. The relevant columns in the
wherematrix are set to
FALSEof variables that are not block members. A variable may appear in multiple blocks. In that case, it is effectively re-imputed each time that it is visited.