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IMDb Standard Deviation

Adds standard deviation to IMDb ratings breakdown pages.

  1. // ==UserScript==
  2. // @name         IMDb Standard Deviation
  3. // @namespace    http://userscripts.org/users/7063
  4. // @include      https://www.imdb.com/title/tt*/ratings
  5. // @include      https://www.imdb.com/title/tt*/ratings/
  6. // @include      https://www.imdb.com/title/tt*/ratings-*
  7. // @include      https://www.imdb.com/title/tt*/ratings?*
  8. // @version      2025.1.13.4.31
  9. // @grant        none
  10. // @description  Adds standard deviation to IMDb ratings breakdown pages.
  11. // @noframes
  12. // ==/UserScript==
  13.  
  14. (function () {
  15.     "use strict";
  16. 	function go(main) {
  17. 		const votes = [...main.querySelectorAll(".VictoryContainer path ~ text")].map(k => {
  18. 			const text = k.textContent.match(/\((.*)\)/)[1];
  19. 			const km = text.match(/[KM]/);
  20. 			if (km) {
  21. 				return +text.match(/[^KM]+/) * 10 ** {"K": 3, "M": 6}[km];
  22. 			}
  23. 			return +text;
  24. 		});
  25. 		const [product, votecount] = votes.reduce(
  26. 			([p, v], c, i) => [p + c * (10 - i), v + c],
  27. 			[0, 0]
  28. 		);
  29. 		const sumOfSquares = votes.reduce(
  30. 			(p, c, i) => p + Math.pow(10 - i - product / votecount, 2) * c,
  31. 			0
  32. 		);
  33.         const p = document.createElement("p");
  34. 		p.textContent = `${Math.sqrt(sumOfSquares / (votecount - 1)).toFixed(2)} Standard deviation`;
  35. 		p.classList.add("cSLvSW");
  36. 		main.append(p);
  37. 	}
  38. 	const obParams = [document.body, { childList: true, subtree: true }];
  39. 	const observer = new MutationObserver(() => {
  40. 		observer.disconnect();
  41. 		const histo = document.querySelector(`[data-testid="histogram-container"]`);
  42. 		if (histo) {
  43. 			go(histo);
  44. 		} else {
  45. 			observer.observe(...obParams);
  46. 		}
  47. 	});
  48. 	observer.observe(...obParams);
  49.  
  50. }());