Extracts incomplete cases from a data set. Missing values in x are coded
as NA.
The companion function for selecting the complete cases is cc().
Usage
ic(x, drop = TRUE)
Arguments
x
An R object. Currently supported are methods for the
following classes: mids, mira, mipo, data.frame
and matrix. In addition, x can be a vector of any kind.
drop
A logical flag for matrices and arrays. If drop=TRUE the
result is coerced to the lowest possible dimension.
Value
A vector, matrix of data.frame containing the data of the incomplete
cases.
Author(s)
Stef van Buuren, 2010.
See Also
na.omit, cc, cci, ici,
ccn, icn
Examples
ic(nhanes) # get the 12 rows with incomplete cases
ic(nhanes[1:10,]) # incomplete cases within the first ten rows
ic(nhanes[,2:3]) # restrict extraction to variables bmi and hyp