A weight functions used to downweigh outliers.
huber(input, co, shape = c("full", "lower", "upper"))
an R list of vector of normalized mean (log intensities).
cutoff used in determining weights.
parameter determining which outliers are weighted: "full" - both values above and below -threshold are downweighted;\ "lower" - only values below threshold are downweighted; \ "upper" - only values above threshold are downweighted.
a vector of weights.
Huber, P. J. (1981) Robust Statistics. John Wiley & Sons