[R] Bootstrapping pairs (was Re: [none])

Roger Peng rpeng at stat.ucla.edu
Wed Oct 16 20:13:48 CEST 2002

```I think you can use the 'boot' library for this kind of problem.  Suppose
a had a matrix called 'data' which is n x 2 and I want to bootstrap a
statistic (called 'my.statistic') which operates on the entire matrix.

boot.func <- function(x, i) { my.statistic(x[i,]) }
b <- boot(data, boot.func, R = 1000)

The object 'b' contains the bootstrapped values of your statistic
(obtained by resampling rows of the matrix, which in this case is
resampling pairs).

-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On Tue, 15 Oct 2002, Katalin  Csillery wrote:

>
> Hi,
>
> I have a coding problem. I have data pairs, and I want to calculate a
> parameter for the data pairs as a whole data set (so not using the
> information that thely are pairs) I am looking for bias in that certain
> parameter so I want to bootstrap these data pairs(!), and than calculate
> the parameter. I run into a coding problem. How should I define theta in
> order to resample the pairs, but than use the ncol=2 matrix as a whole in
> the bootstrap function.
> Does anybody have an idea for that?
>
> Thanks, Kati
>
> _____________________________________________________________________________
> Katalin Csillery
>
> Division of Biological Sciences
> University of Montana
> Missoula MT 59801
> Phone: 406 243 6106
> E-mail: csillery at selway.umt.edu
> _____________________________________________________________________________
>
>
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