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Calculate out of sample linear fit predictions.
xlin_fits_R(x, y, w)
vector of predictions.
NumericVector, x-coords of values to group (length>=2).
NumericVector, values to group in order.
NumericVector, weights (positive).
xlin_fits_R(c(1, 2, 3, 4), c(1, 2, 2, 1), c(1, 1, 1, 1))
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