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# Asymmetric Least Squares (Efron, 1991)
aSolver<-function(z, a, extra) {
x <- z
if ((is.null(extra$weights)) || (is.null(extra$y)) || (is.null(extra$aw)) || (is.null(extra$bw))) stop("aSolver needs the additional arguments y, weights, aw, bw!")
w <- extra$weights
z <- extra$y
aw <- extra$aw
bw <- extra$bw
fobj <- function(x) sum(w*(x-z)^2*ifelse(x<z, aw, bw))
gobj <- function(x) 2*w*(x-z)*ifelse(x<z, aw, bw)
return(fSolver(x,a,list(fobj=fobj,gobj=gobj)))
}
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