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Geographic Tools for Studying Gerrymandering
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christopherkenny/geomander
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Focuses on creating data sets and other tools that help makeunderstanding gerrymandering faster and easier. Designed for easypreparation to run simulation analysis with the R package redist, but isaimed at the geographic aspects of redistricting, not partitioningmethods. Most of these tools are gathered from seminar papers and do notcorrespond to a single publication.
You can install the released version of geomander fromCRAN with:
install.packages("geomander")And the development version fromGitHub with:
# install.packages("devtools")devtools::install_github("christopherkenny/geomander")
A very common task is aggregating block data to precincts.
library(geomander)library(tidyverse)#> ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──#> ✔ dplyr 1.1.4 ✔ readr 2.1.4#> ✔ forcats 1.0.0 ✔ stringr 1.5.1#> ✔ ggplot2 3.4.4 ✔ tibble 3.2.1#> ✔ lubridate 1.9.3 ✔ tidyr 1.3.0#> ✔ purrr 1.0.2#> ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──#> ✖ dplyr::filter() masks stats::filter()#> ✖ dplyr::lag() masks stats::lag()#> ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors# load precinctsdata('va18sub')# create block datablock<- create_block_table(state='VA',county='087')# match the geographiesmatches<- geo_match(from=block,to=va18sub)# Aggregateprec<- block2prec(block_table=block,matches=matches)
Other important tasks include breaking data into pieces by blocksunderlying them.
library(geomander)library(tidyverse)# load precinctsdata("va18sub")# subset to target areava18sub<-va18sub|> filter(COUNTYFP=='087')
Then we can get common block data:
block<- create_block_table(state='VA',county='087')
And estimate down to blocks
disagg<- geo_estimate_down(from=va18sub,to=block,wts=block$vap,value=va18sub$G18USSRSTE)
For more information, see the documentation and vignettes, available athttps://christophertkenny.com/geomander/
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Geographic Tools for Studying Gerrymandering
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