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GetDnb <- function(ns, x, y,beta){ uniq <- sort(unique(y)) ds <- matrix(1, nrow=length(uniq), ncol=ncol(x)) for(k in 1:length(uniq)){ a <- colSums(x[y==uniq[k],])+beta b <- colSums(ns[y==uniq[k],])+beta ds[k,] <- a/b } return(ds) }