[R] Using function 'boot on a bi-polar sample'

From: Briggs, Meredith M <Meredith.Briggs_at_team.telstra.com>
Date: Tue 10 May 2005 - 14:44:59 EST

Hello

I'm not sure I'm using boot correctly:

I have a list of values for a variable in BUCKET[, j] I want to use function 'boot' to estimate a confidence interval on the mean of the non-zero data. The data can be bi-polar or skewed. Is this the correct use of boot to establish a mean and standard deviation or median and percentiles?

	x<-BUCKET[, j]
          	mean.fun<-function(x,i) {mean(x[x>0])}
	median.fun<-function(x,i) {median(x[x>0])}
	print(mean.fun(x))
	print(median.fun(x))
      	B.mean<-boot(x,mean.fun,R=999)
	B.median<-boot(x,mean.fun,R=999)
      	print(B.mean)
	print(B.median)

I need the 'boot' function to sample repeatedly from the density distribution of the raw data and calculate means, medians etc.

How do I pull out the mean, median, deviations and percentiles into variables within R?

thanks
Meredith



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 Received on Tue May 10 15:00:04 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:31:40 EST