Adds standard deviation to IMDb ratings breakdown pages.
// ==UserScript==
// @name IMDb Standard Deviation
// @namespace http://userscripts.org/users/7063
// @include https://www.imdb.com/title/tt*/ratings
// @include https://www.imdb.com/title/tt*/ratings/
// @include https://www.imdb.com/title/tt*/ratings-*
// @include https://www.imdb.com/title/tt*/ratings?*
// @version 2025.1.13.4.31
// @grant none
// @description Adds standard deviation to IMDb ratings breakdown pages.
// @noframes
// ==/UserScript==
(function () {
"use strict";
function go(main) {
const votes = [...main.querySelectorAll(".VictoryContainer path ~ text")].map(k => {
const text = k.textContent.match(/\((.*)\)/)[1];
const km = text.match(/[KM]/);
if (km) {
return +text.match(/[^KM]+/) * 10 ** {"K": 3, "M": 6}[km];
}
return +text;
});
const [product, votecount] = votes.reduce(
([p, v], c, i) => [p + c * (10 - i), v + c],
[0, 0]
);
const sumOfSquares = votes.reduce(
(p, c, i) => p + Math.pow(10 - i - product / votecount, 2) * c,
0
);
const p = document.createElement("p");
p.textContent = `${Math.sqrt(sumOfSquares / (votecount - 1)).toFixed(2)} Standard deviation`;
p.classList.add("cSLvSW");
main.append(p);
}
const obParams = [document.body, { childList: true, subtree: true }];
const observer = new MutationObserver(() => {
observer.disconnect();
const histo = document.querySelector(`[data-testid="histogram-container"]`);
if (histo) {
go(histo);
} else {
observer.observe(...obParams);
}
});
observer.observe(...obParams);
}());