raw_moran | R Documentation |
This function computes the Moran's I index of spatial correlation at lag 1.
raw_moran(mat)
mat |
A matrix |
This function returns the spatial correlation as measured by
the Moran's I index. If the variance of the matrix is zero, then
NaN
is returned. This function assumes a 4-way neighborhood, and does
not wrap around at the sides of the matrix.
The Moran's I numeric value as a numeric number.
indicator_moran
, generic_sews
# Spatial correlation of white noise is close to zero rmat <- matrix(runif(1000) > .5, ncol = 100) raw_moran(rmat) # Spatial correlation of a half-ones / half-zeros matrix is close to one. # This would produce close but inaccurate results in version <3.0.2 m <- cbind(matrix(1, nrow = 100, ncol = 50), matrix(0, nrow = 100, ncol = 50)) raw_moran(m)
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