On Jan 20, 2010, at 10:23 AM, <aaron.fo...@students.tamuk.edu> <aaron.fo...@students.tamuk.edu
> wrote:
Hello,
I was able to bootstrap 1000 times, 20 times (20 columns of 1000
values). Is there a way to get mean for each column?
?colMeans
Thanks!
Aaron
Date: Sat, 16 Jan 2010 00:04:59 +0100
From: stephan.kola...@gmx.de
To: aaron.fo...@students.tamuk.edu
CC: r-help@r-project.org
Subject: Re: [R] bootstrapping
Hi Aaron,
try the argument "statistic=mean". Then boot() will give you the mean
turn angle in your actual data (which appears to be 6 degrees,
judging
from what you write), as well as the means of the bootstrapped data.
Then you can get (nonparametric) bootstrap CIs by
quantile(boot$t,probs=c(.025,.975)). As far as I can see, there is
really no need to look at sd().
A more interesting question would be how to deal with the fact that
-180=+180, there may be something to think about here...
HTH,
Stephan
aaron.fo...@students.tamuk.edu schrieb:
Hi All,
I'm new to R so please bear with me. I have a dataset with 337
turn angles ranging from -180 to 180 degrees. I need to bootstrap
(sample with replacement) 1,000 times to create expected average
turn angle with 95% CIs. The code is pretty straightforward (<-
boot(data =, statistic = ,R =)) but I am unsure how to input my
observed mean (6 degrees) and standard deviation (66 degrees) into
the statistic component. I realize there is a 'function' code but
I can't seem to carry the results over to the 'boot' code.
Thanks,
Aaron M. Foley
PhD Candidate
Caesar Kleberg Wildlife Research Institute
Texas A&M University - Kingsville
Cousins Hall, Room 201
Kingsville, TX 78363
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
