preserve county and municipality boundaries as much as possible
preserve whole communities of interest
Algorithmic Constraints
We enforce a maximum population deviation of 0.5%. We use a pseudo-county constraint described below which attempts to mimic the norms in Colorado of generally preserving county, city, and township boundaries.
No manual pre-processing decisions were necessary.
Simulation Notes
We sample 10,000 districting plans for Colorado across two independent runs of the SMC algorithm, and then thin the sample down to 5,000 plans.
To balance county and municipality splits, we create pseudocounties for use in the county constraint, which leads to fewer municipality splits than using a county constraint. Note that Adams, Arapahoe, El Paso, and Jefferson Counties and the city of Denver must be split due to their large populations, although within the counties, we avoid splitting any municipality.
Redistricting requirements
In Colorado, districts must, under Article V, Section 47 of the 2016 Colorado Revised Statutes:
Algorithmic Constraints
We enforce a maximum population deviation of 0.5%. We use a pseudo-county constraint described below which attempts to mimic the norms in Colorado of generally preserving county, city, and township boundaries.
Data Sources
Data for Colorado comes from the ALARM Project's 2020 Redistricting Data Files.
Pre-processing Notes
No manual pre-processing decisions were necessary.
Simulation Notes
We sample 10,000 districting plans for Colorado across two independent runs of the SMC algorithm, and then thin the sample down to 5,000 plans. To balance county and municipality splits, we create pseudocounties for use in the county constraint, which leads to fewer municipality splits than using a county constraint. Note that Adams, Arapahoe, El Paso, and Jefferson Counties and the city of Denver must be split due to their large populations, although within the counties, we avoid splitting any municipality.
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