gravity | R Documentation |
A function to calculate the matrix of gravity coupling based on distance and population size
gravity(tau1, tau2, rho, pop, distance)
tau1 |
recipient exponent |
tau2 |
donor exponent |
rho |
distance exponent |
pop |
a vector of population sizes |
distance |
a matrix of distances |
A matrix of gravity coupling
sirSpatmod
require(ncf) data(usflu) usdist = gcdist(usflu$Longitude, usflu$Latitude) G = gravity(0.3, 0.6, 3, usflu$Pop, usdist)
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