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Dear Helpers   I have a sample frame and i have sampled from it using three methods and now i want to calculate the statistics but i only get the population parameters.   H <- matrix(rnorm(100, mean=50000, sd=5000)) sampleframe=data.frame(type=c(rep("H",100)),value=c(H)) sampleframe   str=strata(sampleframe,c("type"),size=c(20,), method="srswor") sample.strat<-getdata(sampleframe,str) sample.strat length(H) i get:   length(H) [1] 100 Desire to get: length(H) [1] 20   Best Regards    ...