Message-ID: <544854C2.6090707@auckland.ac.nz>
Date: 2014-10-23T01:07:14Z
From: Rolf Turner
Subject: Kest (spatstat) and "r" values
In-Reply-To: <54480CA0.6080401@upm.es>
On 23/10/14 08:59, Marcelino de la Cruz wrote:
> Maybe the information related to r you are looking for is in the Warning
> section:
>
> "Warnings
>
> The estimator of K(r) is approximately unbiased for each fixed r. Bias
> increases with r and depends on the window geometry. For a rectangular
> window it is prudent to restrict the r values to a maximum of 1/4 of the
> smaller side length of the rectangle".
>
> Maybe I'm wrong but I think that Kest computest K(r) by default for r
> up to 1/4 of the shorter side of the *enclosing rectangle* of your window.
That is indeed correct, modulo a possible adjustment (which I believe
rarely gets applied in practice) in terms of the estimated intensity of
the process. See the code for rmax.rule() if you are interested in the
details.
cheers,
Rolf
--
Rolf Turner
Technical Editor ANZJS