gravity {epimdr2} | R Documentation |
A function to calculate the matrix of gravity coupling based on distance and population size
Description
A function to calculate the matrix of gravity coupling based on distance and population size
Usage
gravity(tau1, tau2, rho, pop, distance)
Arguments
tau1 |
recipient exponent |
tau2 |
donor exponent |
rho |
distance exponent |
pop |
a vector of population sizes |
distance |
a matrix of distances |
Value
A matrix of gravity coupling
See Also
Examples
require(ncf)
data(usflu)
usdist = gcdist(usflu$Longitude, usflu$Latitude)
G = gravity(0.3, 0.6, 3, usflu$Pop, usdist)
[Package epimdr2 version 1.0-9 Index]