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| Keywords: Mest weightfunc.jpg en Weight functions for different M estimators The parameter are choosen after the defalt values in SPSS own Sigbert Klinke 2008-11-19 <pre> z <- -1000 1000 /100 Hubert k k <- 1 339 wh <- 1 abs z < k + k sign z /z abs z >k Hampel a <- 1 7 b <- 3 4 c <- 8 5 wha <- 1 abs z < a + a sign z /z abs z >a abs z < b + a c-abs z / c-b sign z /z abs z >b abs z < c Andrews wave a <- 1 34 pi wav <- a/ pi z sin pi z/a abs z < a Tukey's biweight a <- 4 685 wtb <- 1-z 2/a 2 1-z 2/a 2 abs z < a plot z wh type l main Hubert k 1 339 plot z wha type l main Hampel a 1 7 b 3 4 c 8 5 plot z wav type l main Andrews wave a 1 34 pi plot z wtb type l main Tukey's biweight a 4 685 </pre> Created with R Check categories 2009 February 12 de wikipedia M-Schätzer 1 Statistics | ||||
