{
  "id": 1214,
  "title": "Item Response Theory",
  "url": "/competitions/WhatDoYouKnow/discussion/1214",
  "author_name": "",
  "post_date": "2012-01-02T19:47:33.830Z",
  "votes": null,
  "comment_count": 4,
  "views": 4019,
  "content": "<p>Hi, I know there's an introductory post about this but I think the Forum is broken and is not allowing me to go to the 2nd page of topics.</p>\r\n<p>Anyway, I'm having trouble understanding IRT and reverse engineering the code. Could someone, in simple terms, explain to me how the user ability and question difficulty is worked out.</p>\r\n<p>ta</p>\r\n<p>&nbsp;EDIT: Are these just the &quot;random effects&quot; output from LME?</p>",
  "messages": [
    {
      "id": "7624",
      "postDate": "01/02/2012 19:47:33",
      "content": "<p>Hi, I know there's an introductory post about this but I think the Forum is broken and is not allowing me to go to the 2nd page of topics.</p>\r\n<p>Anyway, I'm having trouble understanding IRT and reverse engineering the code. Could someone, in simple terms, explain to me how the user ability and question difficulty is worked out.</p>\r\n<p>ta</p>\r\n<p>&nbsp;EDIT: Are these just the &quot;random effects&quot; output from LME?</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "7627",
      "postDate": "01/02/2012 23:56:34",
      "content": "<p>Strange, the pagination does seem broken. Here's a direct link to the second page of the forum: http://www.kaggle.com/c/WhatDoYouKnow/forums?page=2</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "7628",
      "postDate": "01/03/2012 01:23:35",
      "content": "<p>[quote=Domcastro;7624]</p>\r\n<p>Hi, I know there's an introductory post about this but I think the Forum is broken and is not allowing me to go to the 2nd page of topics.</p>\r\n<p>[/quote]</p>\r\n<p>Sorry about that, this was caused by a bug. It should be fixed now.</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "8089",
      "postDate": "01/13/2012 15:30:34",
      "content": "<p>In case someone wants a deeper understanding of IRT, I found these material useful</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "8137",
      "postDate": "01/17/2012 16:59:23",
      "content": "<p>Read about Rasch Theory</p>\r\n<p>Having item fixed and person random - is a good way to estimate the difficulty of the several questions - and is a good estimator in models</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 7627,
      "author_name": "robs5654",
      "author_url": "",
      "post_date": "01/02/2012 23:56:34",
      "content": "<p>Strange, the pagination does seem broken. Here's a direct link to the second page of the forum: http://www.kaggle.com/c/WhatDoYouKnow/forums?page=2</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 7628,
      "author_name": "jeffmoser",
      "author_url": "",
      "post_date": "01/03/2012 01:23:35",
      "content": "<p>[quote=Domcastro;7624]</p>\r\n<p>Hi, I know there's an introductory post about this but I think the Forum is broken and is not allowing me to go to the 2nd page of topics.</p>\r\n<p>[/quote]</p>\r\n<p>Sorry about that, this was caused by a bug. It should be fixed now.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 8089,
      "author_name": "shaz24",
      "author_url": "",
      "post_date": "01/13/2012 15:30:34",
      "content": "<p>In case someone wants a deeper understanding of IRT, I found these material useful</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 8137,
      "author_name": "rkirana",
      "author_url": "",
      "post_date": "01/17/2012 16:59:23",
      "content": "<p>Read about Rasch Theory</p>\r\n<p>Having item fixed and person random - is a good way to estimate the difficulty of the several questions - and is a good estimator in models</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "7624": "",
    "7627": "",
    "7628": "",
    "8089": "",
    "8137": ""
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  "source": "meta"
}