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aretificial
2004 Jul 26
1
group definition for a bootstrap
Hi,
This is probably really simple, but I am clearly not R-minded, I have read
the help files, and reread them, and I still can't work out what to do...
I have a data frame (d) with 3 columns (age (0-5), quarter (1-4) and x).
I want to estimate the precision of my mean x by age and quarter, so I want
to carry out a bootstrap for each group.
I am trying to do this within a loop, so I don't