{
  "id": 1234,
  "title": "Zeroes found in outcome?",
  "url": "/competitions/WhatDoYouKnow/discussion/1234",
  "author_name": "",
  "post_date": "2012-01-08T01:12:46.687Z",
  "votes": null,
  "comment_count": 3,
  "views": 2098,
  "content": "<p>Hey guys,</p>\r\n<p>Curious if anyone's found a determinate for why zeroes exist in the outcome table? I'd say it represents missing data, but if we know the test and question information, as well as a breakdown if the question was answered or not(skipped or whatever the case\r\n may be), I'm not sure where these NA values came from (there's about 250 of them).</p>\r\n<p>Would love to hear theories/ideas. Thanks!</p>",
  "messages": [
    {
      "id": "7760",
      "postDate": "01/08/2012 01:12:46",
      "content": "<p>Hey guys,</p>\r\n<p>Curious if anyone's found a determinate for why zeroes exist in the outcome table? I'd say it represents missing data, but if we know the test and question information, as well as a breakdown if the question was answered or not(skipped or whatever the case\r\n may be), I'm not sure where these NA values came from (there's about 250 of them).</p>\r\n<p>Would love to hear theories/ideas. Thanks!</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "7761",
      "postDate": "01/08/2012 02:35:55",
      "content": "<p>In the valid_training file, outcome 0 was used in Jul/Aug 2010, and outcome 3 was/is used Aug 2010 to Nov 2011. My suspicion is that outcome 0 was an early version of 'timeout'; other fields (answered_at, and answer_id) seem consistent with this hypothesis.</p>\r\n<p>--Steve</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "8085",
      "postDate": "01/13/2012 04:17:46",
      "content": "<p>Thanks! That makes sense.&nbsp;</p>\r\n<p>On another note, game_type 6 is equal to null. I'm not sure if this would be a similar case, but it also has an incredibly small number of samples compared to both training and test data. Many of them have answer_id 25553, and every outcome is either correct\r\n or timeout. Again, would love to hear theories (or more info from grockit guys)</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "8101",
      "postDate": "01/14/2012 17:04:04",
      "content": "<p>In valid_training, game_type == 6 only occurred on Oct 13-14, 2011. I suspect it marks either a database glitch, or an experimental game type that didn't work out. I don't see any pattern in the distribution of the other game types in the neighboring weeks\r\n to suggest it was a replacement for an existing game type. I don't know why the outcome and correct attributes turned out in the way you noticed.</p>\r\n<p>--Steve</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 7761,
      "author_name": "sbagley",
      "author_url": "",
      "post_date": "01/08/2012 02:35:55",
      "content": "<p>In the valid_training file, outcome 0 was used in Jul/Aug 2010, and outcome 3 was/is used Aug 2010 to Nov 2011. My suspicion is that outcome 0 was an early version of 'timeout'; other fields (answered_at, and answer_id) seem consistent with this hypothesis.</p>\r\n<p>--Steve</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 8085,
      "author_name": "podopie",
      "author_url": "",
      "post_date": "01/13/2012 04:17:46",
      "content": "<p>Thanks! That makes sense.&nbsp;</p>\r\n<p>On another note, game_type 6 is equal to null. I'm not sure if this would be a similar case, but it also has an incredibly small number of samples compared to both training and test data. Many of them have answer_id 25553, and every outcome is either correct\r\n or timeout. Again, would love to hear theories (or more info from grockit guys)</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 8101,
      "author_name": "sbagley",
      "author_url": "",
      "post_date": "01/14/2012 17:04:04",
      "content": "<p>In valid_training, game_type == 6 only occurred on Oct 13-14, 2011. I suspect it marks either a database glitch, or an experimental game type that didn't work out. I don't see any pattern in the distribution of the other game types in the neighboring weeks\r\n to suggest it was a replacement for an existing game type. I don't know why the outcome and correct attributes turned out in the way you noticed.</p>\r\n<p>--Steve</p>",
      "votes": null,
      "replies": []
    }
  ],
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}