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samp
2011 Jul 11
2
lm: mark sample used in estimation
...example.
But I am ideally looking for a way that allows one to use any formula
in lm, and still be able to mark the estimation sample.
Function/option I am missing? The best I could come up with:
> lm.D9 <- lm(weight ~ group, model=TRUE)
> ind <- as.numeric(row.names(lm.D9$model))
> esamp <- rep(0,length(group)) #substitute nrow(data.frame used in estimation) for length(group)
> esamp[ind] <- 1
> esamp
[1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1
Is this "safe" (recommended?)?
Appreciate any help.
Best, A