In Kentucky, under the Criteria and Standards for Congressional Redistricting adopted by Interim Joint Committee on State Government’s Redistricting Subcommittee in 1991, districts must:
be contiguous
have equal populations
be geographically compact
preserve county and municipality boundaries as much as possible
preserve communities of interest as much as possible
Interpretation of requirements
We enforce a maximum population deviation of 0.5%. We use a pseudo-county constraint described below which attempts to mimic the norms in Kentucky of generally preserving county, city, and township boundaries.
No manual pre-processing decisions were necessary.
Simulation Notes
We sample 8,000 districting plans for Kentucky across two independent runs of the SMC algorithm, and then thin the sample down to 5,000 plans.
We use a pseudo-county constraint to limit the county and municipality (i.e. city and township) splits. Municipality lines are used in Jefferson County, which has a population larger than the target population for a congressional district.
Validation
SMC: 5,000 sampled plans of 6 districts on 3,693 units
`adapt_k_thresh`=0.985 • `seq_alpha`=0.5
`est_label_mult`=1 • `pop_temper`=0
Plan diversity 80% range: 0.46 to 0.78
R-hat values for summary statistics:
pop_overlap total_vap plan_dev comp_edge comp_polsby pop_hisp pop_white
1.0026795 1.0056163 0.9998512 1.0014006 1.0089357 1.0038177 1.0001899
pop_black pop_aian pop_asian pop_nhpi pop_other pop_two vap_hisp
1.0020155 1.0026037 1.0004992 1.0002646 1.0006421 1.0014589 1.0018988
vap_white vap_black vap_aian vap_asian vap_nhpi vap_other vap_two
1.0006832 1.0024479 1.0016443 1.0004699 1.0001827 1.0000130 1.0019312
pre_16_rep_tru pre_16_dem_cli uss_16_rep_pau uss_16_dem_gra arv_16 adv_16 arv_18
1.0013822 1.0028450 1.0006595 1.0144964 1.0006365 1.0013169 NA
adv_18 arv_20 adv_20 county_splits muni_splits ndv nrv
NA NA NA 1.0061338 1.0034688 1.0013169 1.0006365
ndshare e_dvs pr_dem e_dem pbias egap
1.0021110 1.0022326 NaN 1.0009358 1.0010513 1.0013598
Error in if (any(rhats >= 1.05)) { :
missing value where TRUE/FALSE needed
Redistricting requirements
In Kentucky, under the Criteria and Standards for Congressional Redistricting adopted by Interim Joint Committee on State Government’s Redistricting Subcommittee in 1991, districts must:
Interpretation of requirements
We enforce a maximum population deviation of 0.5%. We use a pseudo-county constraint described below which attempts to mimic the norms in Kentucky of generally preserving county, city, and township boundaries.
Data Sources
Data for Kentucky comes from the ALARM Project's 2020 Redistricting Data Files.
Pre-processing Notes
No manual pre-processing decisions were necessary.
Simulation Notes
We sample 8,000 districting plans for Kentucky across two independent runs of the SMC algorithm, and then thin the sample down to 5,000 plans. We use a pseudo-county constraint to limit the county and municipality (i.e. city and township) splits. Municipality lines are used in Jefferson County, which has a population larger than the target population for a congressional district.
Validation
Checklist
TODO
lines from the template code have been removedenforce_style()
to format my coderedist_map
andredist_plans
objects, and summary statistics) have been edited@CoryMcCartan