[R] reason for na.last=TRUE in rank

From: Alejandro Munoz del Rio <munoz_at_stat.wisc.edu>
Date: Fri 20 May 2005 - 03:01:02 EST


Dear UseRs,

Could someone explain to me why the default behaviour of rank() is to assign the largest rank to missing data

> rank(c(3, 1, NA))

[1] 2 1 3

as opposed to what I would hazard would be the expected 2, 1, NA?

Despite consistency being the hobgoblin of little minds, of two closely related functions one handles NAs in the same way (order()) but another one doesn't (sort()). order() also uses the "NA last" rule by default, whereas sort() removes NAs.

alejandro



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