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This function takes a stratified sample without replacement from a data set.
stratsample(strata, counts)vector of indices into strata giving the sample
Vector of stratum identifiers; will be coerced to character
named vector of stratum sample sizes, with names corresponding to the values of as.character(strata)
The "sampling" package has many more sampling algorithms.
data(api)
s<-stratsample(apipop$stype, c("E"=5,"H"=4,"M"=2))
table(apipop$stype[s])
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