[R] Combine variables of different length

[Johannes Radinger]

Hi,

I have got a dataset with
the variables Y,X1,X2,X3.
Some of these variables contain NAs. Therefore
incomplete datasets aren't recognized when
I am doing a regression like:

model <- lm(Y~X1+X2+X3)

so the resulting vector of resid(model) is
obviousely shorter then the original variables.

How can I combine the residuals-vector with
the original dataset (Y,Xi,...). I recognize
that the residuals give also a kind of an index
like from the row names (2,5,7,8,9,12)...

Is it possible to use in such a case the
data.frame command? Or what is the best
way to attach the resulting residuals back to
the original dataframe with incomplete datasets?

thanks

/Johannes
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