Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-23 Thread Roger Bivand
On Sat, 24 Nov 2007, Sisi wrote: > Dear all, > > It seems from the previous mails that you require the objective of the study > in order to give approprate suggestions. No. Like all the R lists, this list expects posters to follow the posting guide, which involves providing reproducable examples

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-23 Thread Sisi
Dear all, It seems from the previous mails that you require the objective of the study in order to give approprate suggestions. My research objective is to detect the spatial, temporal and space-time clustering of the birdflu outbreaks at the continental level. Considering your suggestion about t

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-23 Thread Dan Putler
Hi Sisi, A three continent study area is very large. It strikes me that border effects would likely matter, so would probably need to be corrected for. Although, what the correct border definition is will depend on what your data relate to. Consequently, the natural question to ask is what kinds o

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-23 Thread Roger Bivand
On Fri, 23 Nov 2007, Sisi wrote: Dear all, Thanks for your quick reply! For Roger, I checked the sessioninfo and mine is same as yours. My object size is indeed quite big, it is 275608. So I simplified the polygon and erased all the small islands, only hold the main land of Asia, Europe and Af

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-23 Thread Sisi
Dear all, Thanks for your quick reply! For Roger, I checked the sessioninfo and mine is same as yours. My object size is indeed quite big, it is 275608. So I simplified the polygon and erased all the small islands, only hold the main land of Asia, Europe and Africa. After I loaded the polygon win

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-22 Thread Putler, Dan
your case (and a lot easier to implement). Dan -Original Message- From: [EMAIL PROTECTED] on behalf of Roger Bivand Sent: Wed 11/21/2007 10:48 PM To: Sisi Cc: r-sig-geo@stat.math.ethz.ch Subject: Re: [R-sig-Geo] Large dataset on Ripley's K function On Thu, 22 Nov 2007, Sisi wrote:

Re: [R-sig-Geo] Large dataset on Ripley's K function

2007-11-21 Thread Roger Bivand
On Thu, 22 Nov 2007, Sisi wrote: Dear Roger Bivand and Dan Putler, Currently I'm working on the spatial point data analysis using Kernel estimation (spatstat), Ripley's K function (spatstat) and space-time K function (splancs). My research is at the continental level and the region area include

[R-sig-Geo] Large dataset on Ripley's K function

2007-11-21 Thread Sisi
Dear Roger Bivand and Dan Putler, Currently I'm working on the spatial point data analysis using Kernel estimation (spatstat), Ripley's K function (spatstat) and space-time K function (splancs). My research is at the continental level and the region area includes Asia, Europe and Africa. The metho