ABBA.js A/B Test Analysis

ABBA.js is a JavaScript library designed for statistical analysis relevant to A/B testing, including functions for normal and binomial distributions, and a utility for computing experiment results. It provides methods for density, cumulative distribution function (CDF), survival function, and inverse CDF for both normal and binomial distributions. Additionally, it offers an `Experiment` class to calculate proportion, relative improvement, and p-value for A/B test variations against a baseline. The package is currently at version 0.1.4, published in 2014, and appears to be abandoned, with no significant updates or active maintenance in over 7 years. Its core differentiator lies in offering common statistical distribution functions and A/B test result computation directly in JavaScript, without external dependencies, though its age makes it unsuitable for modern ESM-first environments.