An implementation of Krippendorff's alpha, based on the Wikipedia article.

Ratings can be numbers or strings; missing values are represented by undefined.

npm install krippendorff

import { alpha } from "krippendorff";

const ratingMatrix = [
  [1, 2, 1], // ratings by first rater
  [1, 1, 1], // ratings by second rater
  [1, 2], // ratings by third rater; note missing rating for third sample
];

console.log(alpha(ratingMatrix)); // 0.41666666666666663

This project is licensed under the terms of the MIT open source license. Please refer to LICENSE for the full terms.

• Max Schaefer max-schaefer@github.com

This is a side project of mine and is not officially supported. However, if you have questions or feedback, feel free to file an issue and I will do my best to respond.