spatial variance

spatial variance

Usage

spvar(x, wt, method = "cpp")

Arguments

x

A numerical vector .

wt

The spatial weight matrix.

method

(optional) The method for calculating spatial variance, which can be chosen as either cpp or r. Default is cpp.

Value

A numerical value.

Details

The spatial variance formula is \(\Gamma = \frac{\sum_i \sum_{j \neq i} \omega_{ij}\frac{(y_i-y_j)^2}{2}}{\sum_i \sum_{j \neq i} \omega_{ij}}\)

Examples

gzma = sf::read_sf(system.file('extdata/gzma.gpkg',package = 'sdsfun'))
wt1 = inverse_distance_swm(gzma)
spvar(gzma$PS_Score,wt1)
#> [1] 2.406486