Common Arguments to `redist` Functions"

In redist: Simulation Methods for Legislative Redistricting

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

library(redist)
data(iowa)
iowa_map <- redist_map(iowa, existing_plan = cd_2010, total_pop = pop)

adj

• Definition: An adjacency list that is represented by a list with one entry for each redistricting unit in a map, where each entry is an integer vector of adjacent units.

• Deprecated alternative arguments: adjacency, adj.list, adj.obj, adjlist

• Example:

# Standard eval - 
adj <- redist.adjacency(shp = iowa)
# tidy eval - 
adj <- get_adj(iowa_map)

head(adj)

# Plot it!
redist.plot.adj(shp = iowa_map)

ndists

• Definition: The number of districts in a plan, a positive integer

• Deprecated alternative arguments: Ndistrict, n_dists

• Example:

# Standard eval - 
ndists <- 4
# tidy eval - stored within redist_map object
attr(iowa_map, 'ndists')

nsims

• Definition: The number of simulations to run. This is a positive integer.

• Deprecated alternative arguments: nsamp

• Example:

nsims <- 100

pop_tol

• Definition: The maximum symmetric deviation from perfect population parity allowed. This is a positive numeric.

• Deprecated alternative arguments: thresh, popcons, pop_constraint

• Example:

# standard eval - 
pop_tol <- 0.01

# tidy eval - stored within redist_map object
# - getting
get_pop_tol(iowa_map)
# - setting
iowa_map <- set_pop_tol(iowa_map, pop_tol = 0.01)

plan

• Definition: A one-dimensional array of district assignments with one for each redistricting unit, typically numbered 1:ndists, though sometimes 0:(ndists - 1)

• Deprecated alternative arguments: district_membership

• Example:

sim <- redist.rsg(adj = adj, total_pop = iowa$pop, ndists = 4, pop_tol = 0.01)

head(sim$plan)

plans

• Definition: A two-dimensional array of district assignments, where each column is a plan.

• Deprecated alternative arguments: partitions, district_membership, districts, cdvec

• Example:

sims <- redist_smc(map = iowa_map, nsims = 10, silent = TRUE)
plans <- get_plans_matrix(sims)

init_plan

• Definition: The initial plan to start a Markov Chain Monte Carlo chain from. An integer vector with one entry for each redistricting unit.

• Deprecated alternative arguments: initcds

• Example:

# standard eval - 
init_plan <- iowa$cd_2010

# tidy eval - stored within redist_map object
get_existing(iowa_map)

total_pop

• Definition: A vector of non-negative integer entries with one per redistricting unit. The entries should reflect the total population within each unit.

• Deprecated alternative arguments: pop, population, popvec, fullpop, fullpopvec

• Example:

# standard eval
total_pop <- iowa$pop

# tidy eval - a column within the redist_map object tracked by attributes
iowa_map[[attr(iowa_map, 'pop_col')]]

group_pop

• Definition: A vector of non-negative integer entries with one per redistricting unit. The entries should reflect a subgroup population of interest within each unit.

• Deprecated alternative arguments: group_pop, grouppop, grouppopvec

• Example:

iowa$white

pop_bounds

• Definition: A three entry vector for asymmetric population parity control. The first entry is the lower bound for population, the second is the target population, and the third is the upper bound for population.

• Example:

# tidy eval - stored in redist_map object
attr(iowa_map, 'pop_bounds')

ncores

• Definition: The number of cores to use for parallel processes. A positive integer. ncores = 1 indicates running in serial, while ncores > 1 indicates running in parallel.

• Deprecated alternative arguments: ncores, nthreads, n_cores

• Example:

redist documentation built on April 3, 2023, 5:46 p.m.