redist.subset

Subsets a shp object along with its adjacency. Useful for running smaller analyses
on pairs of districts. Provide population, ndists, pop_tol, and sub_ndists to get proper
population parity constraints on subsets.

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.subset function

<dl><dt>shp</dt>
<dd>An sf object</dd>
<dt>adj</dt>
<dd>A zero-indexed adjacency list. Created with
<code>redist.adjacency</code> if not supplied.</dd>
<dt>keep_rows</dt>
<dd>row numbers of precincts to keep. Random submap selected if not supplied.</dd>
<dt>total_pop</dt>
<dd>numeric vector with one entry for the population of each precinct.</dd>
<dt>ndists</dt>
<dd>integer, number of districts in whole map</dd>
<dt>pop_tol</dt>
<dd>The strength of the hard population constraint.</dd>
<dt>sub_ndists</dt>
<dd>integer, number of districts in subset map</dd></dl>

Arguments

Subset a shp — redist.subset

<dl>

<dt>shp</dt>
<dd>An sf object</dd>


<dt>adj</dt>
<dd>A zero-indexed adjacency list. Created with
<code>redist.adjacency</code> if not supplied.</dd>


<dt>keep_rows</dt>
<dd>row numbers of precincts to keep. Random submap selected if not supplied.</dd>


<dt>total_pop</dt>
<dd>numeric vector with one entry for the population of each precinct.</dd>


<dt>ndists</dt>
<dd>integer, number of districts in whole map</dd>


<dt>pop_tol</dt>
<dd>The strength of the hard population constraint.</dd>


<dt>sub_ndists</dt>
<dd>integer, number of districts in subset map</dd>

</dl>

redist.subset: Subset a shp

Description

Usage

Value

Arguments