[R] Parallel computations using snow: how to combine boot objects?
Luke Tierney
luke at stat.uiowa.edu
Tue Jan 25 21:06:35 CET 2005
The example ducks that issue. Someone needs to write a function for
merging these results. Probably just involves making a suitable call
to boot.return, which is what happens at the end of boot(), but I
don't know if anyone has actually done this yet.
luke
On Fri, 21 Jan 2005, BEER Michael wrote:
> Hello,
>
> I'm trying to do some bootstrapping in a parallel environment (Linux
> cluster) in order to estimate confidence intervals for a certain
> parameter. Following the example in the documentation of the "snow"
> package (http://www.stat.uiowa.edu/~luke/R/cluster/cluster.html), I
> launch my computations by something like
>
> > cl.nuke.boot <-
> + clusterCall(cl,boot,nuke.data, nuke.fun, R=500, m=1,
> + fit.pred=new.fit, x.pred=new.data)
>
> which gives me a list of n boot objects (where n is the number of nodes
> in my cluster). So far, so good.
>
> However, if I now want to go further, I need to combine all these boot
> objects to a single one which I can pass to boot.ci for example. Is
> there a recommended way to do this?
>
> Thanks,
> Michael
>
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--
Luke Tierney
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke at stat.uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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