Nothing
inclusionprobastrata<-function (strata, nh)
{ N = length(strata)
EPS = 1e-6
if (min(unique(strata)) < 1)
stop("the stratification variable has incorect values (less than 1)\n")
Nh=as.vector(table(strata))
if(any(nh/Nh>1+EPS)) warning("in a stratum the sample size is larger than the population size\n")
pik=nh[strata]/Nh[strata]
pik
}
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