[R-sig-Geo] R-sig-Geo Digest, Vol 85, Issue 15

[David Méndez]

Enviado desde mi HTC

----- Mensaje original -----
De: r-sig-geo-request at stat.math.ethz.ch
Enviado: Miércoles, 15 de Septiembre de 2010 05:30 a.m.
Para: r-sig-geo at stat.math.ethz.ch
Asunto: R-sig-Geo Digest, Vol 85, Issue 15

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Today's Topics:

   1. Re: Inverting the scale in heat.colors (Manuel Sp?nola)
   2. calculating the maximum absolute difference between the
      empirical and theoritical Ripley's K-function (Hamid Ghorbani)


----------------------------------------------------------------------

Message: 1
Date: Tue, 14 Sep 2010 05:17:36 -0600
From: Manuel Sp?nola <mspinola10 at gmail.com>
To: Greg Snow <Greg.Snow at imail.org>
Cc: "r-sig-geo at stat.math.ethz.ch" <r-sig-geo at stat.math.ethz.ch>
Subject: Re: [R-sig-Geo] Inverting the scale in heat.colors
Message-ID: <4C8F59D0.7030802 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

  Thank you very much Greg.
Best,

Manuel

On 13/09/2010 10:33 a.m., Greg Snow wrote:
> Others have shown how to create your own palette, which is good general information.  But for your case you may be able to simply use the rev function with heat.colors.
>


-- 
Manuel Sp?nola, Ph.D.
Instituto Internacional en Conservaci?n y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola at una.ac.cr
mspinola10 at gmail.com
Tel?fono: (506) 2277-3598
Fax: (506) 2237-7036



------------------------------

Message: 2
Date: Tue, 14 Sep 2010 21:51:30 +0430
From: Hamid Ghorbani <hhamidghorbani at gmail.com>
To: r-sig-geo at stat.math.ethz.ch
Subject: [R-sig-Geo] calculating the maximum absolute difference
	between the empirical and theoritical Ripley's K-function
Message-ID:
	<AANLkTi=45UmKK+7gA6ZZYq8gf=J=RLojbMsrf6otQpXd at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Dear researchers,
In spatstat and for calculating the maximum absolute difference
between the empirical Ripley's K-function (\hat(K), isotropic edge
correction) and the theoretical K-function for a simulated Poisson
process in a fixed window (suppose 3D case and fix number of points
(n) in W), we usually use a sequence of regular grid points. On the
other hand we know that the empirical K function is a step function
and hence the max occurs only at a jump point. suppose x is a typical
jump point (x is one of considered grid points), we have actually two
differences at x because we should also consider the difference
between \hat{K}(x-) and K(x-), where x- is the value just
infinitesimally smaller than x. The problem is if we calculate the
absolute difference only at the regular jump points like x, we shall
underestimate the true unknown maximum absolute difference between
\hat(K) and the theoretical K. How we can deal with this problem.
Shall taking very fine grids points would solve the problem? If yes
some word of  theoretical reasoning please in direction of
programming.

Many thanks in advance
Yours,
Hamid



------------------------------

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End of R-sig-Geo Digest, Vol 85, Issue 15