{
  "id": 1514,
  "title": "userid = 0 ??",
  "url": "/competitions/kddcup2012-track2/discussion/1514",
  "author_name": "",
  "post_date": "2012-03-10T23:25:29.597Z",
  "votes": null,
  "comment_count": 2,
  "views": 2739,
  "content": "<p>Hi,</p>\r\n<p>I've noticed that&nbsp;78391188 row in training.txt has userid = 0, and few more after it. Actually there are exactly&nbsp;37733352 record with userid=0. In&nbsp;userid_profile.txt file there isn't any user with id equal to 0, so how should we interpret this situation?\r\n Are they missing/unknown data? Can you provide us a md5 hash of each files.</p>\r\n<p>thanks</p>",
  "messages": [
    {
      "id": "9214",
      "postDate": "03/10/2012 23:25:29",
      "content": "<p>Hi,</p>\r\n<p>I've noticed that&nbsp;78391188 row in training.txt has userid = 0, and few more after it. Actually there are exactly&nbsp;37733352 record with userid=0. In&nbsp;userid_profile.txt file there isn't any user with id equal to 0, so how should we interpret this situation?\r\n Are they missing/unknown data? Can you provide us a md5 hash of each files.</p>\r\n<p>thanks</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "9219",
      "postDate": "03/11/2012 08:38:00",
      "content": "<p>Yes .This is clearly mentioned in the problem statement too..</p>\r\n<p>&quot;12. UserID&nbsp;</p>\r\n<p>This is the key of 'userid_profile.txt'.&nbsp; When we cannot identify the user, this field has a special value of 0.&quot;</p>\r\n<p>&nbsp;</p>\r\n<p>Thanks</p>\r\n<p>data learner</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "9243",
      "postDate": "03/12/2012 13:41:30",
      "content": "<p>i think that the userid is 0 means the user is not the registered user, and he just a normal visitor</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 9219,
      "author_name": "sreeaurovindh",
      "author_url": "",
      "post_date": "03/11/2012 08:38:00",
      "content": "<p>Yes .This is clearly mentioned in the problem statement too..</p>\r\n<p>&quot;12. UserID&nbsp;</p>\r\n<p>This is the key of 'userid_profile.txt'.&nbsp; When we cannot identify the user, this field has a special value of 0.&quot;</p>\r\n<p>&nbsp;</p>\r\n<p>Thanks</p>\r\n<p>data learner</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 9243,
      "author_name": "andyxs",
      "author_url": "",
      "post_date": "03/12/2012 13:41:30",
      "content": "<p>i think that the userid is 0 means the user is not the registered user, and he just a normal visitor</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "9214": "",
    "9219": "",
    "9243": ""
  },
  "source": "meta"
}