{
  "id": 6669,
  "title": "How to calculate the NDCG",
  "url": "/competitions/yandex-personalized-web-search-challenge/discussion/6669",
  "author_name": "",
  "post_date": "2013-12-23T11:59:30.900Z",
  "votes": null,
  "comment_count": 3,
  "views": 1361,
  "content": "<p>I did not exactly understand the method which calculate the NDCG. How can the &nbsp;iDCG be calculated?</p>\n<p>thanks!!</p>",
  "messages": [
    {
      "id": "36564",
      "postDate": "12/23/2013 11:59:30",
      "content": "<p>I did not exactly understand the method which calculate the NDCG. How can the &nbsp;iDCG be calculated?</p>\n<p>thanks!!</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "36593",
      "postDate": "12/23/2013 20:13:33",
      "content": "<p>Hi Fantasy,</p>\n<p>&nbsp; &nbsp;The iDCG is the idealized DCG. It's the exact same function, but with the URLs sorted by their true relevance.</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "36614",
      "postDate": "12/24/2013 06:30:48",
      "content": "",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "36615",
      "postDate": "12/24/2013 06:31:29",
      "content": "<p>[quote=kinnskogr;36593]</p>\n<p>Hi Fantasy,</p>\n<p>&nbsp; &nbsp;The iDCG is the idealized DCG. It's the exact same function, but with the URLs sorted by their true relevance.</p>\n<p>[/quote]</p>\n<p>Thanks you for your answer.</p>\n<p>That just means we could not know the true relevance and what we can do is to let</p>\n<p>the numerator the bigger the better. That is right?</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 36593,
      "author_name": "kinnskogr",
      "author_url": "",
      "post_date": "12/23/2013 20:13:33",
      "content": "<p>Hi Fantasy,</p>\n<p>&nbsp; &nbsp;The iDCG is the idealized DCG. It's the exact same function, but with the URLs sorted by their true relevance.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 36614,
      "author_name": "xieshukun",
      "author_url": "",
      "post_date": "12/24/2013 06:30:48",
      "content": "",
      "votes": null,
      "replies": []
    },
    {
      "id": 36615,
      "author_name": "xieshukun",
      "author_url": "",
      "post_date": "12/24/2013 06:31:29",
      "content": "<p>[quote=kinnskogr;36593]</p>\n<p>Hi Fantasy,</p>\n<p>&nbsp; &nbsp;The iDCG is the idealized DCG. It's the exact same function, but with the URLs sorted by their true relevance.</p>\n<p>[/quote]</p>\n<p>Thanks you for your answer.</p>\n<p>That just means we could not know the true relevance and what we can do is to let</p>\n<p>the numerator the bigger the better. That is right?</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "36564": "",
    "36593": "",
    "36614": "",
    "36615": ""
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  "source": "meta"
}