[R] Moving-Tiles Bootstrap

[Jeff Newmiller]

A) Reposting the same message as a separate thread is bad netiquette.

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C) You probably ought to read the posting guide.

D) This is a list about using R. Posting theoretical questions without corresponding R code that illustrates what how far you have progressed is unlikely to elicit a response. 

E) Some questions require just the right combination of expertise and free time to answer. Yours seems to be bleeding into a theoretical discussion of a very specific knowledge domain... I certainly don't know the answer. You may need to correspond with authors of packages that almost apply to your problem or post on a more focused discussion group (perhaps one that discusses statistical theory) if you don't get an answer here. Or just wait a week for the right person to read your question.
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Sent from my phone. Please excuse my brevity.

Kim Elmore <kim.elmore at noaa.gov> wrote:

>I wish to perform moving tiles bootstrap resampling on some gridded
>data 
>meteorological data. I've many years experience with S-Plus, but it has
>
>no way to perform a moving-tiles bootstrap. Within R I've learned how
>to 
>use quadratresample() with the spatstats package and would be happy to 
>simply use empirical percentiles if generating the replicates were
>fast, 
>but it isn't. So, I'd like to employ bootstrap tilting to generate my 
>confidence intervals. On my machine (older Athlon, XP sp3, 4 GB) it
>took 
>about 48 h to generate 5000 moving tiles replicates. But, the boot 
>package contains boot.tilt and I should be able to do well enough with 
>the statistics I need (mean and RMS) to get by with several hundred 
>samples instead of several thousand.
>
>I can certainly build a function that generates the statistic I want 
>from a moving-tiles replicate. My problem is that the resampling
>process 
>isn't as simple as boot.tilt() expects (I'm not simply resampling rows 
>of a data frame). But, the function that does what I need doesn't fit 
>into how boot.tilt() expects the resampling process to work. I can 
>generate a string of replicates easily enough -- how might I wrap such
>a 
>set of replicates into an object on which tilting could be performed 
>absent the internal generation of the replicates themselves?
>
>Kim Elmore
>-- 
>
>Kim Elmore, Ph.D. (CCM, PP SEL/MEL/Glider, N5OP, 2nd Class 
>Radiotelegraph, GROL)
>
>/"Human beings, who are almost unique in having the ability to learn 
>from the experience/
>
>/of//others, are also remarkable for their apparent disinclination to
>do 
>so/."/-- Douglas Adams/
>
>
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>
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