wilson-rate

Problem Statement:

There are different way of rating things E.g. Upvotes/Downvotes in Reddit's post E.g. 5-Star rating system in e-commerce products

Goal:

Write a solution to sort items correctly based on ratings

Solution:

Lower bound of Wilson's Confidence Interval

const wilsonRate = require('wilson-rate')
const upvotes = 100
const downvotes = 50

// Convert 5-star rating system to upvotes and downvotes
const stars = wilsonRate.stars(100, 0, 0, 10, 100)
console.log(wilsonRate.wilson(stars.upvotes, stars.downvotes))

console.log(wilsonRate.average(upvotes, downvotes))
console.log(wilsonRate.wilson(upvotes, downvotes))
console.log(wilsonRate.mid(upvotes, downvotes))

Reference:

1. http://stackoverflow.com/questions/19613023/wilsons-confidence-interval-for-5-star-rating
2. http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
3. http://www.itl.nist.gov/div898/handbook/prc/section2/prc241.html