dra-analytics

This repo & package consolidates all the metrics used in DRA analytics into one place. It started as v2, because v1 was delivered by a combination repos & packages:

• district-analytics
• dra-score
• dra-graph
• compactness, and
• racial voting

The goals of this consolidation were to make the analytics code:

1. More transparent -- easier to show/explain
2. More maintainable -- easier to support
3. More general -- easier to re-use, because the DRA-specific parts are clearly isolated & there is a CLI

Because the partisan analytics can now be calculated at a command line, independent of any tool, you can compute them for several elections, one at a time, and then generate statistics for them.

Details

This repo & package can be integrated into other tools. The libraries here are normally included like this:

import { Compactness, Equal, Graph, Minority, Partisan, Splitting } from '@dra2020/dra-analytics';

Then the various functions of the different sets are available under their appropriate symbol.

These are all the libraries:

• Compactness: Various measures of compactness.
• Equal: Population deviation & 'roughly' equal population.
• Graph: Checks for contiguity & embeddedness.
• Minority: The opportunity for minorities to elect representatives of their choice and racially polarized voting analysis.
• Partisan: Various measures of partisan bias & responsiveness, as well as support for rank-vote graphs and seats-votes curves.
• Rate: Normalization utilities as well as DRA-specific ratings.
• Splitting: County- & district-splitting and COI splitting.

Supporting types are in the Types library and supporting utilities are in the Utils library.

The analytics in DRA include metrics favored by many scholars.

A command-line interface (CLI) was added in v3.

Updates

• 12/18/21 -- Added multi-member district (MMD) support to makePopulationScorecard().

Build status for master branch

Repo contents

There are three packages that are part of this repo:

1. lib: building dra-analytics.js, the production code
2. cli: building dra-<command>.bundle.js, a set of command line utilities
3. test: automated test code run by jest

Developing in this repo

npm install install all dependencies

npm run build build all bundles

npm run buildpartisan build the partisan command

npm run buildcompactness build the compactness command

npm run buildsplitting build the splitting command

npm run test run automated jest tests