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sainte-lague

v3.0.0

Published

Sainte-Laguë method for seat distribution used in multiple parliamentary elections all over the world

Downloads

1,414

Readme

sainte-lague

An implementation of the Sainte-Laguë (also known as Webster or Schepers) method. Parliament seat allocation algorithm used in multiple countries such as Germany, Latvia, New Zealand etc…

Attention: Since some countries (like Latvia or Norway) 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.

npm version License Contact me

Installation

npm install sainte-lague

Usage

This package is ESM only.

import sainteLague from 'sainte-lague'

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 opt = { // options, can be null
	draw: false // if a draw would be necessary to determine the seat count (e.g. 11 seats and two parties with 100 votes each), the library will throw an error, unless you set draw: true, in which case it will assert the ambiguous seat(s) randomly
}

const parliament = sainteLague(electionResults, seats, opt)

The parliament variable will look like this:

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

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Contributing

If you found a bug or want to propose a feature, feel free to visit the issues page.