With a sample data frame:
d = data.frame(id = rep(c(1,2,3,4),5), x = round(rexp(20), digits=2), y =
round(runif(20), digits=2))
I would like to generate 100 bootstrap data with replacement and save each
bootstrap data as b1, b2, ..., b100. I attempted the sample function but
could not make it work
With a data frame (call it *d*) composed of 2000 individuals and
*n*observations for each individual (thus
*2000n* observations in total), I would like to generate *k* bootstrap
samples with replacement from *d*. Amongst other variables, *d* has a
numeric variable *id* taking on identical value for
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