id: Add id variables to data frame
Description
Construct id variable for patient data.
Usage
id(x, id = c("persnr", "pnr", "pat_id", "pn", "id"), ignore.case = TRUE)
Arguments
id
names of a possible id variable found in x
ignore.case
should name matching be done regardless of character case?
Value
Character variable with either the first name from id
found in
x
or rownames(x)
if no named column found.