4 ms·

That's not right. Factor _levels_ can only be integers, factor _labels_ can only be strings since labels are the printable representation of a level. Maybe you

• rcthompson 9y ago
  Well, I don't know if there's a standard terminology used elsewhere, but what you call labels, R calls levels.
  • stewbrew 9y ago
    Erm ... Well, I admit it's somewhat confusing. factor(x = character(), levels, labels = levels, exclude = NA, ordered = is.ordered(x), nmax = NA) [...] levels : an optional vector of the values (as character strings) that x might have taken. The default is the unique set of values taken by as.character(x), sorted into increasing order of x. Note that this set can be specified as smaller than sort(unique(x)). labels : either an optional character vector of (unique) labels for the levels (in the same order as levels after removing those in exclude), or a character string of length 1. This way, you can do something like that: > x <- 1:3 > factor(x, levels = 1:2, labels = c("foo", "bar")) [1] foo bar <NA> Levels: foo bar But this actually is: > factor(as.character(x), levels = c("1", "2"), labels = c("foo", "bar")) [1] foo bar <NA> Levels: foo bar