Dear R-people,
I would like to construct a model frame while keeping eventual NA-s in
it. The code looks like in lm():
m <- match(c("formula", "data", "subset", "weights", "na.action",
"offset"), names(mf), 0)
mfO <- mf[c(1, m)]
mfO$drop.unused.levels <- TRUE
mfO[[1]] <- as.name("model.frame")
names(mfO)[2] <- "formula"
mfO <- eval(mfO, parent.frame())
The problem is that eval() removes all the observation which include
NA-s.
Are there ways to get the frames and keep NA-s? I see, I can play
around with the "na.action" attribute of the resulting frame, but how
can I set the na.action?
Thanks in advance,
Ott
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