Dear Francisca, On Wed, 16 Feb 2005 11:28:24 -0500 "Francisca xuan" <[EMAIL PROTECTED]> wrote: > Dear Sir/Madam: > > I try to use the library boot to bootstrap the median of a data set. > Can anybody tell me why this doesn't work? Thanks. > > library(boot) > x=rnorm(100) > boot(x,median,999) > > I know I can write a simple code for bootstrapping myself. but I am > so curious to know why the above code does not work.
Take a closer look at ?boot: The function that computes the statistic that you're bootstrapping (in a simple situation like this) should take two arguments -- the data and an index vector. Thus, boot.median <- function(x, i) median(x[i]) result <- boot(x, boot.median, 999) I hope this helps, John ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
