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hare-niemeyer

2.0.0 • Public • Published

hare-niemeyer

An implementation of the Hare-Niemeyer (also known as Hamilton or largest remainder) method. Parliament seat allocation algorithm used in multiple countries around the world.

Attention: Since some countries use a modification of the algorithm instead of this vanilla version, you should check your country's electoral legislature. Furthermore, I don't take any responsibility for the accuracy of the calculated numbers, even though I'm pretty confident with my implementation.

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Installation

npm install --save hare-niemeyer

Usage

const hareNiemeyer = require('hare-niemeyer')
 
const electionResults = { // number of votes per party
    socialists: 130755,
    conservatives: 102068,
    liberals: 34012,
    greens: 31090,
    crazypeople: 11111
}
const seats = 420 // number of seats to be distributed
 
const parliament = hareNiemeyer(electionResults, seats, draw=true)

The parliament variable will look like this:

{
    "socialists": 178,
    "conservatives": 139,
    "liberals": 46,
    "greens": 42,
    "crazypeople": 15
}

The draw option changes the behaviour of the algorithm in case of equal quota remainders for multiple parties. Usually, in this case the elections administrator would draw by lot which party gets the remaining seat. The script does this for you if the draw option is true or not set at all (default behaviour). If you change the option to false, the script will return the raw quotas for the involved parties instead:

const electionResults = { // number of votes per party
    socialists: 10,
    conservatives: 15,
    liberals: 1,
    greens: 4
}
const seats = 100 // number of seats to be distributed
 
const parliament = hareNiemeyer(electionResults, seats, false)

In this case, the parliament variable looks like this:

{
    "socialists": 33.333333333333,
    "conservatives": 50,
    "liberals": 3.333333333333,
    "greens": 13.333333333333
}

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Contributing

If you found a bug, want to propose a feature or feel the urge to complain about your life, feel free to visit the issues page.

install

npm i hare-niemeyer

Downloadsweekly downloads

799

version

2.0.0

license

MIT

homepage

github.com

repository

Gitgithub

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