[R] Moving-Tiles Bootstrap

[Kim Elmore]

I wish to proffer my sincere apologies to both you and the list. I had 
not seen my posting appear -- it was initially held for moderator 
approval, but I never saw that it was released. During the subscription 
process, I had used an incorrect e-mail address and so withdrew the 
post. Within my subscription settings, I had asked to see my own 
postings but, so far have not. I have now doubled checked that this is 
the case. Hence, the multiple posts. Again, apologies. Finally, this 
seems to be a more nuts-and-bolts list and that is not intended to 
address the admittedly esoteric topic about which I posted my query so, 
again, apologies to all. Finally, I think I have set Thunderbird to 
strip off all HTML in this posting. Again, apologies for the HTML in 
prior posts -- I certainly intend for there to be none in this one.

Kim Elmore

On 1/24/2012 11:31 AM, Jeff Newmiller wrote:
> A) Reposting the same message as a separate thread is bad netiquette.
>
> B) Posting HTML email on this list is strongly discouraged.
>
> 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.
> ---------------------------------------------------------------------------
> Jeff Newmiller                        The     .....       .....  Go Live...
> DCN:<jdnewmil at dcn.davis.ca.us>         Basics: ##.#.       ##.#.  Live Go...
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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/
>>
>>
>> 	[[alternative HTML version deleted]]
>>
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//