#' @export
strat.ratio.ppn.var<-function(dat,cond,by.stratum=FALSE)
{
for(i in 1:dat$M) dat[[i]]$y.value<-(eval(parse(text=paste("dat[[i]]$y.value",cond,sep="")))*1)
est<-strat.ratio.tot.var(dat,by.stratum=by.stratum)
if(by.stratum) {
est$est<-est$est/sum(dat$N)^2
est$est.by.stratum<-est$est.by.stratum/dat$N^2
} else est<-est/sum(dat$N)^2
est
}
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