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 the raster mask, would this be able to
give me a solution that elivates the problem I experienced in the R code
given previously. It is difficult to find the solution to make the programme
work. I really appreciate any suggestions you can provide.

Kind regards,
Sisi


    Roger Bivand
The edge correction is the real issue. K is measuring the number of points
within areas of distance bands adjusted for the area within the edges. So
you have to correct - but shorelines may not be appropriate for birds -
how far can your birds fly over water? Have you considered using a raster
mask which would permit contact over channels between islands?


Roger


On 23/11/2007, Dan Putler <dan.putler@sauder.ubc.ca> wrote:
>
> 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
> of objects do your points represent?
>
> Dan
>
> >

	[[alternative HTML version deleted]]


