Thank you, Why sigma = 10?, what function can I use for choose the best sigma?. And I looked the info about density.ppp and it says it use the Gaussian Kernel. But, if we look on wikipedia: http://en.wikipedia.org/wiki/Kernel_(statistics) , it says, there are more kernel function than the Gaussian Kernel, so my question is how do I know wether I have to use for example a Gaussian kernel or a Tricube Kernel.
Regards, Ariel 2013/7/4 Juan Tomas Sayago Gomez <[email protected]> > Hello, > you can use the commands in spatstat > > library(spatstat) > > summary(swedishpines) > plot(density(swedishpines, sigma = 10)) > then check the help in the spatstat command density.ppp > > Also check the material in this course http://www.csiro.au/resources/pf16h > > > Juan > > > On Thu, Jul 4, 2013 at 11:32 AM, Ariel Fuentesdi <[email protected] > > wrote: > >> Hello, >> >> I have raingauges as points and I want to make an heatmap with those >> points. So, I understand I need to do a kernel density estimation, but, >> there are different kernel functions. Thus, my questions is: how do I know >> which kernel function I need to apply to my data? Do I need to run a >> previous test first? >> >> I believe I can select the function using grass, but how can I do it with >> R? Do I have to use the KernSmooth package? How Can I map that ? >> >> Regards, >> Ariel >> >> [[alternative HTML version deleted]] >> >> _______________________________________________ >> R-sig-Geo mailing list >> [email protected] >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> > > > > -- > Juan Tomás Sayago Gómez > Graduate Research Assistant > West Virginia University - RRI > 886 Chestnut Ridge Road, Room 520 > P.O. Box 6825 > Morgantown, WV 26506-6825 > [[alternative HTML version deleted]]
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