redist.constraint.helper

Enables researchers to sample redistricting plans from a pre-specified
target distribution using Sequential Monte Carlo and Markov Chain Monte Carlo
algorithms. The package allows for the implementation of various constraints in
the redistricting process such as geographic compactness and population parity
requirements. Tools for analysis such as computation of various summary statistics
and plotting functionality are also included. The package implements the SMC
algorithm of McCartan and Imai (2023) <doi:10.1214/23-AOAS1763>, the enumeration
algorithm of Fifield, Imai, Kawahara, and Kenny (2020) <doi:10.1080/2330443X.2020.1791773>,
the Flip MCMC algorithm of Fifield, Higgins, Imai and Tarr (2020) <doi:10.1080/10618600.2020.1739532>,
the Merge-split/Recombination algorithms of Carter et al. (2019) <arXiv:1911.01503>
and DeFord et al. (2021) <doi:10.1162/99608f92.eb30390f>, and the Short-burst
optimization algorithm of Cannon et al. (2020) <arXiv:2011.02288>.

Christopher T. Kenny

redist

Simulation Methods for Legislative Redistricting

Cory McCartan

Ben Fifield

Kosuke Imai

Jun Kawahara

Alexander Tarr

Michael Higgins

redist.constraint.helper function

<dl><dt>constraints</dt>
<dd>Vector of constraints to include. Currently only 'vra' implemented.</dd>
<dt>tgt_min</dt>
<dd>Defaults to 0.55. If 'vra' included, the minority percent to encourage in each district.</dd>
<dt>group_pop</dt>
<dd>A vector of populations for some subgroup of interest.</dd>
<dt>total_pop</dt>
<dd>A vector containing the populations of each geographic unit.</dd>
<dt>ndists</dt>
<dd>The total number of districts.</dd>
<dt>nmmd</dt>
<dd>The number of majority minority districts to target for 'vra' constraint</dd>
<dt>strength_vra</dt>
<dd>The strength of the 'vra' constraint. Defaults to 2500.</dd>
<dt>pow_vra</dt>
<dd>The exponent for the 'vra' constraint. Defaults to 1.5.</dd></dl>

Arguments

Create Constraints for SMC — redist.constraint.helper

<dl>

<dt>constraints</dt>
<dd>Vector of constraints to include. Currently only 'vra' implemented.</dd>


<dt>tgt_min</dt>
<dd>Defaults to 0.55. If 'vra' included, the minority percent to encourage in each district.</dd>


<dt>group_pop</dt>
<dd>A vector of populations for some subgroup of interest.</dd>


<dt>total_pop</dt>
<dd>A vector containing the populations of each geographic unit.</dd>


<dt>ndists</dt>
<dd>The total number of districts.</dd>


<dt>nmmd</dt>
<dd>The number of majority minority districts to target for 'vra' constraint</dd>


<dt>strength_vra</dt>
<dd>The strength of the 'vra' constraint. Defaults to 2500.</dd>


<dt>pow_vra</dt>
<dd>The exponent for the 'vra' constraint. Defaults to 1.5.</dd>

</dl>

Create Constraints for SMC

redist.constraint.helper: Create Constraints for SMC

Description

Usage

Value

Arguments