Add id variables to data frame

Construct id variable for patient data.

id(x, id = c("persnr", "pnr", "pat_id", "pn", "id"), ignore.case = TRUE)

Arguments

x

data frame
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.