```
# Based on weighted Wilcoxon code developed by Terpstra & McKean (2005)
# (http://www.jstatsoft.org/v14/i07) under GPL 2.
hbrwts <-
function (x, y, percent = 0.95, ehat0 = ltsreg(x, y)$residuals)
{
x = as.matrix(x)
n = dim(x)[1]
p = dim(x)[2]
robdis2 <- robdist.hbrfit(x)
cut = qchisq(percent, p)
sigma = mad(ehat0)
m = psi(cut/robdis2)
a = ehat0/(sigma * m)
c = (median(a) + 3 * mad(a))^2
h = sqrt(c)/a
tmp = pairup(h)
psi(abs(tmp[, 1] * tmp[, 2]))
}
```

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