{
  "id": 81855,
  "title": "How to account for value of \"-1\" in city_id?",
  "url": "/competitions/elo-merchant-category-recommendation/discussion/81855",
  "author_name": "",
  "post_date": "2019-02-25T15:36:20.783707400Z",
  "votes": null,
  "comment_count": 1,
  "views": 0,
  "content": "<p>Does anyone know what the value of \"-1\" is supposed to signify in historical_transactions.csv? </p>\n\n<p>Is it just missing data or does it signify something significant like online orders? Has anyone noticed a big effect in their model performance in treating it either way?</p>",
  "messages": [
    {
      "id": "477989",
      "postDate": "02/25/2019 15:36:20",
      "content": "<p>Does anyone know what the value of \"-1\" is supposed to signify in historical_transactions.csv? </p>\n\n<p>Is it just missing data or does it signify something significant like online orders? Has anyone noticed a big effect in their model performance in treating it either way?</p>",
      "rawMarkdown": "Does anyone know what the value of \"-1\" is supposed to signify in historical_transactions.csv? \n\nIs it just missing data or does it signify something significant like online orders? Has anyone noticed a big effect in their model performance in treating it either way?",
      "votes": null
    },
    {
      "id": "478047",
      "postDate": "02/25/2019 16:45:23",
      "content": "<p>\"-1\" means that data is not available. Same as NaN. </p>\n\n<p>\"-1\" occurs when category_1 == Y. state_id is also \"-1\". This indicates that <strong>Address is not available</strong>  (My assumption)</p>\n\n<p>Check my kernel for more info: \n<a href=\"https://www.kaggle.com/sreeedevi/merchant-rating-variables-revealed\">Merchant Rating- Variables Revealed</a></p>",
      "rawMarkdown": "\"-1\" means that data is not available. Same as NaN. \n\n\"-1\" occurs when category_1 == Y. state_id is also \"-1\". This indicates that **Address is not available**  (My assumption)\n\nCheck my kernel for more info: \n[Merchant Rating- Variables Revealed](https://www.kaggle.com/sreeedevi/merchant-rating-variables-revealed)",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 478047,
      "author_name": "sreeedevi",
      "author_url": "",
      "post_date": "02/25/2019 16:45:23",
      "content": "<p>\"-1\" means that data is not available. Same as NaN. </p>\n\n<p>\"-1\" occurs when category_1 == Y. state_id is also \"-1\". This indicates that <strong>Address is not available</strong>  (My assumption)</p>\n\n<p>Check my kernel for more info: \n<a href=\"https://www.kaggle.com/sreeedevi/merchant-rating-variables-revealed\">Merchant Rating- Variables Revealed</a></p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "477989": "Does anyone know what the value of \"-1\" is supposed to signify in historical_transactions.csv? \n\nIs it just missing data or does it signify something significant like online orders? Has anyone noticed a big effect in their model performance in treating it either way?",
    "478047": "\"-1\" means that data is not available. Same as NaN. \n\n\"-1\" occurs when category_1 == Y. state_id is also \"-1\". This indicates that **Address is not available**  (My assumption)\n\nCheck my kernel for more info: \n[Merchant Rating- Variables Revealed](https://www.kaggle.com/sreeedevi/merchant-rating-variables-revealed)"
  },
  "source": "meta"
}