Closed mzwu closed 1 year ago
Looks good to me! For VRA performance, @mzwu and @christopherkenny maybe we should think about the same Democratic performance filter for BVAP #7 as in 2020?
Maybe it would also be good to double check the Percentage of Democratic seats by BVAP rank — I'll copy what that looked like for 2020 here:
bvap_rank dem
<dbl> <dbl>
1 1 0
2 2 0
3 3 0
4 4 0
5 5 0
6 6 0.671
7 7 0.807
Thanks for looking this over @tylersimko! I don't think we ended up doing the Democratic performance filter for BVAP # 7 in 2020 because there was a lot of crossover between BVAP # 6, and that seems to be more of the case in 2010:
bvap_rank dem
<dbl> <dbl>
1 1 0
2 2 0
3 3 0
4 4 0
5 5 0.00035
6 6 0.727
7 7 0.718
Thanks! Okay, I see we are still doing the filtering here though, which looks the same as what I misremembered from 2020. Thank you!
Redistricting requirements
In Alabama, districts must:
Algorithmic Constraints
We enforce a maximum population deviation of 0.5%. We add a hinge Gibbs constraint targeting the same number of majority-minority districts as the enacted plan.
Data Sources
Data for Alabama comes from the ALARM Project's 2020 Redistricting Data Files. Data for the 2010 Alabama enacted congressional map comes from All About Redistricting.
Pre-processing Notes
No manual pre-processing decisions were necessary.
Simulation Notes
We sample 20,000 districting plans for Alabama across two independent runs of the SMC algorithm. We set population temperance at 0.05 to avoid bottlenecks. We remove all plans that do not have any district that has BVAP of over 30% and a majority Democratic average vote share, in order to maintain similar standards as the enacted plan. Such plans comprise less than 2% of the original simulation sample. We then thin the sample to down to 5,000 plans.
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 editedAdditional Notes
BVAP performance plot:![image](https://user-images.githubusercontent.com/55368740/209241799-1662d7ef-497c-4d00-8914-0dee554f77fa.png)
Total Black performant districts:
@tylersimko