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.
---------------------------------------------------------------------------
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DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go...
Live: OO#.. Dead: OO#.. Playing
Research Engineer (Solar/Batteries O.O#. #.O#. with
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Sent from my phone. Please excuse my brevity.
Kim Elmore<kim.elm...@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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