[R] eval while keeping NA-s

From: Ott Toomet <otoomet_at_ut.ee>
Date: Thu 18 Jan 2007 - 13:07:03 GMT


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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