{
  "id": 1992,
  "title": "a little clarity",
  "url": "/competitions/FacebookRecruiting/discussion/1992",
  "author_name": "",
  "post_date": "2012-06-05T21:43:35.903Z",
  "votes": null,
  "comment_count": 1,
  "views": 2924,
  "content": "<p>I'm new to this style of scoring so I want to make sure</p>\r\n<p>(1)&nbsp;&nbsp;&nbsp;&nbsp; If among the 5 items recommended to the user, the user clicked #1, #3, #4, then ap@3 = (1/1 &#43; 2/3)/3 ≈ 0.56</p>\r\n<p>(2)&nbsp;&nbsp;&nbsp;&nbsp; If among the 4 items recommended to the user, the user clicked #1, #2, #4, then ap@3 = (1/1 &#43; 2/2)/3 ≈ 0.67</p>\r\n<p>(3)&nbsp;&nbsp;&nbsp;&nbsp; If among the 3 items recommended to the user, the user clicked #1, #3, then ap@3 = (1/1 &#43; 2/3)/2 ≈ 0.83</p>\r\n<p>shouldn't that be</p>\r\n<p>(1)&nbsp;&nbsp;&nbsp;&nbsp; If among the 5 items recommended to the user, the user clicked #1, #3, #4, then ap@3 = (1/1 &#43; 2/3 &#43; 3/4)/3 ≈ 0.81</p>\r\n<p>(2)&nbsp;&nbsp;&nbsp;&nbsp; If among the 4 items recommended to the user, the user clicked #1, #2, #4, then ap@3 = (1/1 &#43; 2/2 &#43; 3/4)/3 ≈ 0.91</p>\r\n<p>(3)&nbsp;&nbsp;&nbsp;&nbsp; If among the 3 items recommended to the user, the user clicked #1, #3, then ap@3 = (1/1 &#43; 2/3)/2 ≈ 0.83</p>\r\n<p>&nbsp;</p>\r\n<p>*edit* (and if not, could someone explain why the last term was droppped in the first 2&nbsp; but not in the 3rd, again just new to this style of scoring and was looking for clarity)</p>",
  "messages": [
    {
      "id": "11407",
      "postDate": "06/05/2012 21:43:35",
      "content": "<p>I'm new to this style of scoring so I want to make sure</p>\r\n<p>(1)&nbsp;&nbsp;&nbsp;&nbsp; If among the 5 items recommended to the user, the user clicked #1, #3, #4, then ap@3 = (1/1 &#43; 2/3)/3 ≈ 0.56</p>\r\n<p>(2)&nbsp;&nbsp;&nbsp;&nbsp; If among the 4 items recommended to the user, the user clicked #1, #2, #4, then ap@3 = (1/1 &#43; 2/2)/3 ≈ 0.67</p>\r\n<p>(3)&nbsp;&nbsp;&nbsp;&nbsp; If among the 3 items recommended to the user, the user clicked #1, #3, then ap@3 = (1/1 &#43; 2/3)/2 ≈ 0.83</p>\r\n<p>shouldn't that be</p>\r\n<p>(1)&nbsp;&nbsp;&nbsp;&nbsp; If among the 5 items recommended to the user, the user clicked #1, #3, #4, then ap@3 = (1/1 &#43; 2/3 &#43; 3/4)/3 ≈ 0.81</p>\r\n<p>(2)&nbsp;&nbsp;&nbsp;&nbsp; If among the 4 items recommended to the user, the user clicked #1, #2, #4, then ap@3 = (1/1 &#43; 2/2 &#43; 3/4)/3 ≈ 0.91</p>\r\n<p>(3)&nbsp;&nbsp;&nbsp;&nbsp; If among the 3 items recommended to the user, the user clicked #1, #3, then ap@3 = (1/1 &#43; 2/3)/2 ≈ 0.83</p>\r\n<p>&nbsp;</p>\r\n<p>*edit* (and if not, could someone explain why the last term was droppped in the first 2&nbsp; but not in the 3rd, again just new to this style of scoring and was looking for clarity)</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "11408",
      "postDate": "06/05/2012 21:57:44",
      "content": "<p>Sorry for the confusion - that language was taken from another competition where the evaluation metric was MAP@3. It has now been updated.</p>\r\n<p>https://www.kaggle.com/c/FacebookRecruiting/details/Evaluation</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 11408,
      "author_name": "benhamner",
      "author_url": "",
      "post_date": "06/05/2012 21:57:44",
      "content": "<p>Sorry for the confusion - that language was taken from another competition where the evaluation metric was MAP@3. It has now been updated.</p>\r\n<p>https://www.kaggle.com/c/FacebookRecruiting/details/Evaluation</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "11407": "",
    "11408": ""
  },
  "source": "meta"
}