This array is useful for extracting the subset of incomplete cases.
The companion function cci()
selects the complete cases.
ici(x)
Logical vector indicating the incomplete cases,
ici(nhanes) # indicator for 12 rows with incomplete cases
#> [1] TRUE FALSE TRUE TRUE FALSE TRUE FALSE FALSE FALSE TRUE TRUE TRUE
#> [13] FALSE FALSE TRUE TRUE FALSE FALSE FALSE TRUE TRUE FALSE FALSE TRUE
#> [25] FALSE