ggwr.cv.contrib | R Documentation |
This function finds the individual cross-validation score at each observation location, for a generalised GWR model, for a specified bandwidth. These data can be mapped to detect unusually high or low cross-validations scores.
ggwr.cv.contrib(bw, X, Y,family="poisson", kernel="bisquare",adaptive=F,
dp.locat, p=2, theta=0, longlat=F,dMat)
bw |
bandwidth used in the weighting function;fixed (distance) or adaptive bandwidth(number of nearest neighbours) |
X |
a numeric matrix of the independent data with an extra column of “ones” for the 1st column |
Y |
a column vector of the dependent data |
family |
a description of the error distribution and link function to be used in the model, which can be specified by “poisson” or “binomial” |
kernel |
function chosen as follows: gaussian: wgt = exp(-.5*(vdist/bw)^2); exponential: wgt = exp(-vdist/bw); bisquare: wgt = (1-(vdist/bw)^2)^2 if vdist < bw, wgt=0 otherwise; tricube: wgt = (1-(vdist/bw)^3)^3 if vdist < bw, wgt=0 otherwise; boxcar: wgt=1 if dist < bw, wgt=0 otherwise |
adaptive |
if TRUE calculate an adaptive kernel where the bandwidth (bw) corresponds to the number of nearest neighbours (i.e. adaptive distance); default is FALSE, where a fixed kernel is found (bandwidth is a fixed distance) |
dp.locat |
a two-column numeric array of observation coordinates |
p |
the power of the Minkowski distance, default is 2, i.e. the Euclidean distance |
theta |
an angle in radians to rotate the coordinate system, default is 0 |
longlat |
if TRUE, great circle distances will be calculated |
dMat |
a pre-specified distance matrix, it can be calculated by the function |
CV |
a data vector consisting of squared residuals, whose sum is the cross-validation score for the specified bandwidth |
Binbin Lu binbinlu@whu.edu.cn
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