min_move_parity {redist}

Calculates Sparse Population Moves to Minimize Population Deviation

Description

This function computes a minimal set of population moves (e.g., 5 people from district 1 to district 3) to maximally balance the population between districts. The moves are only allowed between districts that share the territory of a county, so that any boundary adjustments are guaranteed to preserve all unbroken county boundaries.

Usage

min_move_parity(map, plan, counties = NULL, penalty = 0.2)

Arguments

map

a redist_map

plan

an integer vector containing the plan to be balanced. Tidy-evaluated.

counties

an optional vector of counties, whose boundaries will be preserved. Tidy-evaluated.

penalty

the larger this value, the more to encourage sparsity.

Value

a list with components:

moves

A tibble describing the population moves

pop_old

The current district populations

pop_new

The district populations after the moves

Examples

data(iowa)
iowa_map <- redist_map(iowa, existing_plan = cd_2010, pop_tol = 0.01)
min_move_parity(iowa_map, cd_2010)