On Tue, 10 May 2005, Briggs, Meredith M wrote:
I'm not sure I'm using boot correctly:
You are not using argument `i'. Have you read the reference: `boot' is
support software for a book? (Or even the definition of `statistic' on the help page?) The bootstrap sample in your case is x[i], not x.
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?
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
