make.visitSequence: Creates a visitSequence argument
Description
This helper function creates a valid visitSequence. The
visitSequence is an argument to the mice function that
specifies the sequence in which blocks are imputed.
Usage
make.visitSequence(data = NULL, blocks = NULL)
Value
Vector containing block names
Arguments
data
A data frame or a matrix containing the incomplete data. Missing
values are coded as NA.
blocks
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 method argument). 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
blocks are imputed. The relevant columns in the where
matrix are set to FALSE of 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.