Nothing
mar.iso=function(x){
Pt=rep(0,dim(x)[3])
Pr=rep(0,dim(x)[3])
for(i in 1:dim(x)[3]){
Pt[i]=(sum(diag(x[,,i])))/sum(x[,,i])
Pr[i]=(sum(rowSums(x[,,i])* colSums(x[,,i])))/
((sum(rowSums(x[,,i])))*(sum(colSums(x[,,i]))))
}
pop=dimnames(x)[[3]]
data.frame(pop,Pt,Pr)
}
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