Compute neighbourhood-based weights for areal (lattice) data

Compute neighbourhood-based weights for areal (lattice) data

Usage

areal_neighbor_weights(i0, adjacency, decay = 1)

Arguments

i0

Integer index of the target (unobserved / held-out) areal unit.

adjacency

A square 0/1 (or weighted) adjacency matrix describing the neighbourhood structure of the areal units (e.g. a spatial contiguity matrix). Row/column i0 corresponds to the target unit.

decay

Numeric decay rate applied to graph distance (number of hops) from i0; larger values down-weight distant neighbours more aggressively. Defaults to 1.

Value

A numeric vector of length nrow(adjacency) with weights based on graph distance from i0 (self-weight is 0, i.e. the target unit is excluded from its own calibration set).