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Performs a stratified bootstrap sample of IDS ensuring the return vector is the same length as the input vector
sample_ids(ids, strata = rep(1, length(ids)))
vector to sample from
strata indicator, ids are sampled within each strata ensuring the that the numbers of each strata are maintained
if (FALSE) { sample_ids( c("a", "b", "c", "d"), strata = c(1,1,2,2)) }
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