Computation of Tukey's Biweight Robust Mean, a robust average that is unaffected by outliers.
a numeric vector
This is a one step computation that follows the Affy whitepaper below see
page 22. This function is called by
chron to calculate a
C determines the point at which outliers are given a
weight of 0 and therefore do not contribute to the calculation of the mean.
C=9 sets values roughly +/-6 standard deviations to 0. C=6 is also used in
tree-ring chronology development. Cook and Kairiukstis (1990) have further
A numeric mean.
Statistical Algorithms Description Document, 2002, Affymetrix. p22.
Cook, E. R. and Kairiukstis, L.A. (1990) Methods of Dendrochronology: Applications in the Environmental Sciences. ISBN-13: 978-0792305866.
Mosteller, F. and Tukey, J. W. (1977) Data Analysis and Regression: a second course in statistics. Addison-Wesley. ISBN-13: 978-0201048544.