rescale_net {migest} | R Documentation |
Rescale net migration total to a global zero sum
Description
Modify a set of net migration (or any numbers) so that they sum to zero.
Usage
rescale_net(
x,
method = "no-switches",
w = rep(1, length(x)),
integer_result = TRUE
)
Arguments
x |
Vector of net migration values |
method |
Method used to adjust net migration values of |
w |
Weights used in rescaling method |
integer_result |
Logical operator to indicate if output should be integers, default is |
Value
Rescales net migration for a number of regions in vector x
to sum to zero. When method="no-switches"
rescaling of values are done for the positive and negative values separately, to ensure the final global sum is zero. When method="switches"
the mean of the unscaled net migration is subtracted from each value.
Author(s)
Guy J. Abel
References
Abel, G. J. (2018). Non-zero trajectories for long-run net migration assumptions in global population projection models. Demographic Research 38, (54) 1635–1662
Examples
# net migration in regions countries (does not add up to zero)
x <- c(-200, -30, -5, 0, 10, 20, 60, 80)
x
sum(x)
# rescale
y1 <- rescale_net(x)
y1
sum(y1)
# rescale without integer restriction
y2 <- rescale_net(x, integer_result = FALSE)
y2
sum(y2)
# rescale allowing switching of signs (small negative value becomes positive)
y3 <- rescale_net(x, method = "switches")
y3
sum(y3)