acfft function

Spatial autocorrelation diagnostics

A function for calculating spatial autocorrelation using Moran's I.

acfft(coord, f, lim1 = 1, lim2 = 2, dmax = 10)

Arguments

• coord: A matrix of two columns with corresponding cartesian coordinates. Currently only supports integer coordinates.
• f: A vector which is the same length as x and y
• lim1: Lower bound for first bin. Default is 1
• lim2: Upper bound for first bin. Default is 2
• dmax: Number of distance bins to examine. Bins are formed by annuli of gradually increasing radii. Default is 10.

Returns

A vector of Moran's I values for each distance bin.

Examples

data(musdata)
coords <- musdata[ ,4:5]
mglm <- glm(musculus ~ pollution + exposure, "poisson", musdata)

ac <- acfft(coords, resid(mglm, type = "pearson"), lim1 = 0, lim2 = 1)
ac

Author(s)

Gudrun Carl