I'm trying to bootstrap resample from a repeated measures dataset. I sample
a vector of "ID"'s from my dataframe with replacement.
Then I merge this back with my dataframe.
I'm re-sampling subjects in the dataset rather than rows of the data.
I thought I could use the left/right join features of the merge to select
the records I want from the dataframe (mydataframe), like this.
boot.sample <- merge( id.boot.draw,mydataframe, by=c("ID") , all.x=TRUE )
when I do that, the correct records are selected from "mydataframe" but the
values for all the variables, other than the matching variable are now "NA".
My other option is to right a for loop, which I would hope to avoid.
Thanks in advance for any suggestions
--
Chris Barker,
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