`opt.llr` <-
function(x, laplace=T) {
o <- order(x$score)
p.ideal <- as.numeric(x$target[o]) ## ideal posterior
if (is.null(x$weight)) x <- transform(x, weight=1) # did we have weights?
w.ideal <- x$weight[o]
nt <- sum(p.ideal)
nn <- sum(1-p.ideal)
if (laplace) {
p.ideal <- c(1,0,p.ideal,1,0) ## lapace's rule of succession
w.ideal <- c(1,1,w.ideal,1,1)
}
p.opt <- monoreg(p.ideal,w=w.ideal)$yf
if (laplace)
p.opt <- p.opt[3:(length(p.opt)-2)]
post.log.odds <- log(p.opt)-log(1-p.opt)
prior.log.odds <- log(nt/nn)
llrs <- post.log.odds - prior.log.odds
llrs[o] <- llrs
transform(x, opt.llr=llrs)
}
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