--------------------- help for robmean ---------------------
Trimmed, winsorized means & Huber 1-step estimator --------------------------------------------------
robmean varname [if exp] [in range] [, trim(pro) k(const) ] Description -----------
robmean computes untrimmed, trimmed, winsorized statistics, 1-step Huber estimator and a modified 1-step estimator.
Options ------- trim indicates the proportion of cases to trim from each end of the distribution (default = 0.2). k the constant used for the M-estimator (default = 1.28).
Examples --------
. robmean write . robmean write, trim(.1)
Reference ---------
Wilcox, R. (2001) Fundamentals of modern statistical methods. New York: Springer. Wilcox, R. (2002) Applying Contemporary Statistical Techniques. San Diego: Academic Press.
Author ------
Philip B. Ender UCLA Department of Education UCLA Academic Technology Services enderatucla.edu