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Youtube Enhanced Score

YouTube likes/dislikes ratio may hold very little value on highly rated channel since ie. 94% and 96% can be a difference between bad and good video for that channel. This extension computes a logit out of likes ratio thus unbounding and centering it, so it can be more easily human interpretable.

  1. // ==UserScript==
  2. // @name        Youtube Enhanced Score
  3. // @description YouTube likes/dislikes ratio may hold very little value on highly rated channel since ie. 94% and 96% can be a difference between bad and good video for that channel. This extension computes a logit out of likes ratio thus unbounding and centering it, so it can be more easily human interpretable.
  4. // @namespace   jonnyrobbie
  5. // @include     /https?:\/\/(www\.)?(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"'>]+)/
  6. // @version     1.0.1
  7. // @grant       none
  8. // ==/UserScript==
  9.  
  10.  
  11. function main() {
  12. 	likes = getLikes();
  13. 	score = calcScore(likes);
  14. 	setScore(score);
  15. }
  16.  
  17. function getLikes() {
  18. 	var score = {
  19. 		'likes': parseInt(document.getElementsByClassName("like-button-renderer-like-button")[0].getElementsByClassName("yt-uix-button-content")[0].innerHTML.replace(/,/g, ""), 10),
  20. 		'dislikes': parseInt(document.getElementsByClassName("like-button-renderer-dislike-button")[0].getElementsByClassName("yt-uix-button-content")[0].innerHTML.replace(/,/g, ""), 10)
  21. 	}
  22. 	return score;
  23. }
  24.  
  25. function calcScore(likes) {
  26. 	var score = 0;
  27. 	if (likes.likes == 0 || likes.dislikes == 0) {
  28. 		score = "N/A";
  29. 	} else {
  30. 		var ratio = likes.likes / (likes.likes + likes.dislikes);
  31. 		score = Math.log(ratio) - Math.log(1-ratio); //logit
  32. 		score = score.toFixed(2);
  33. 	}
  34. 	return score;
  35. }
  36.  
  37. function setScore(score) {
  38. 	var elScore = document.getElementsByClassName("watch-view-count")[0];
  39. 	elScore.innerHTML = elScore.innerHTML + " (" + score + ")";
  40. }
  41.  
  42. main();