Please help:
# I have a data frame x:
x <- data.frame(a = c(1:3, NA), b = c(NA, 2:4))
# I run a cross-tab keeping NAs, like this:
table(x[c("a", "b")], useNA = "ifany")
# I want to reproduce it using xtabs, but it ignores NAs:
xtabs(~ a + b, x)
# I can't figure out how to force xtabs to include NAs.
# All my attempts below fail to include NAs:
xtabs(~ a + b, x, na.action(na.pass))
xtabs(~ a + b, x, na.action = "na.pass")
xtabs(~ a + b, x, na.action(na.pass(x)))
xtabs(~ a + b, x, exclude = NULL)
Thank you for your hints!
--
Dimitri Liakhovitski
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