kernrat {splancs} | R Documentation |
Return the ratio of two kernel smoothings
kernrat(pts1,pts2,poly,h1,h2,nx=20,ny=20,kernel='quartic')
pts1,pts2 |
Point data sets |
poly |
A polygon data set |
h1,h2 |
The kernel width parameters, h1 for pts1 , and h2 for pts2
|
nx |
Number of points along the x-axis of the returned grid. |
ny |
Number of points along the y-axis of the returned grid. |
kernel |
Type of kernel function to use. Currently only the quartic kernel is implemented. |
A list with the following components:
x |
List of x-coordinates at which the kernel function has been evaluated. |
y |
List of y-coordinates at which the kernel function has been evaluated. |
z |
A matrix of dimension nx by ny containing the ratio of the kernel functions. |
h |
A vector of length 2 containing h1 and h2 |
kernel |
a character string containing the kernel name. |
Berman M. and Diggle P.J. (1989) Estimating Weighted Integrals of the Second-Order Intensity of Spatial Point Patterns. J. R. Statist Soc B51 81-92; Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.