{
  "id": 198895,
  "title": "Negative time values",
  "url": "/competitions/predict-volcanic-eruptions-ingv-oe/discussion/198895",
  "author_name": "",
  "post_date": "2020-11-23T14:04:20.748341Z",
  "votes": null,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Why are some sensor times negative while others are positive? Should I make them all positive and use that or aggregate them as they are and have the result be the total time for that segment id. Maybe a newbie question but I am a newbie.</p>\n<p>Thanks</p>",
  "messages": [
    {
      "id": "1088299",
      "postDate": "11/23/2020 14:04:20",
      "content": "<p>Why are some sensor times negative while others are positive? Should I make them all positive and use that or aggregate them as they are and have the result be the total time for that segment id. Maybe a newbie question but I am a newbie.</p>\n<p>Thanks</p>",
      "rawMarkdown": "Why are some sensor times negative while others are positive? Should I make them all positive and use that or aggregate them as they are and have the result be the total time for that segment id. Maybe a newbie question but I am a newbie.\n\nThanks",
      "votes": null
    },
    {
      "id": "1098625",
      "postDate": "12/01/2020 18:36:18",
      "content": "<p>The sensor readings are not times, they are positions on a wave.  Think of it like a sound wave, with roughly half the points above and half below the zero line.  <a href=\"https://www.kaggle.com/jesperdramsch/introduction-to-volcanology-seismograms-and-lgbm\" target=\"_blank\">This notebook</a> includes a sample plot of some of the waves.  <a href=\"http://eqseis.geosc.psu.edu/cammon/HTML/Classes/IntroQuakes/Notes/seismometers.html\" target=\"_blank\">This page</a> from Penn State University explains some typical outputs from seismometers.</p>",
      "rawMarkdown": "The sensor readings are not times, they are positions on a wave.  Think of it like a sound wave, with roughly half the points above and half below the zero line.  [This notebook](https://www.kaggle.com/jesperdramsch/introduction-to-volcanology-seismograms-and-lgbm) includes a sample plot of some of the waves.  [This page](http://eqseis.geosc.psu.edu/cammon/HTML/Classes/IntroQuakes/Notes/seismometers.html) from Penn State University explains some typical outputs from seismometers.",
      "votes": null
    },
    {
      "id": "1099974",
      "postDate": "12/02/2020 18:22:02",
      "content": "<p>time_to_eruption has none of the negative values </p>\n<p>and the sensors data is the vibrations captured by them so they can be negative and I suggest to do a frequency analysis to tackle them </p>\n<p><a href=\"https://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda\" target=\"_blank\">https://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda</a><br>\nrefer to my work here, see if it helps</p>",
      "rawMarkdown": "time_to_eruption has none of the negative values \n\nand the sensors data is the vibrations captured by them so they can be negative and I suggest to do a frequency analysis to tackle them \n\nhttps://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda\nrefer to my work here, see if it helps",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 1098625,
      "author_name": "bruceharold",
      "author_url": "",
      "post_date": "12/01/2020 18:36:18",
      "content": "<p>The sensor readings are not times, they are positions on a wave.  Think of it like a sound wave, with roughly half the points above and half below the zero line.  <a href=\"https://www.kaggle.com/jesperdramsch/introduction-to-volcanology-seismograms-and-lgbm\" target=\"_blank\">This notebook</a> includes a sample plot of some of the waves.  <a href=\"http://eqseis.geosc.psu.edu/cammon/HTML/Classes/IntroQuakes/Notes/seismometers.html\" target=\"_blank\">This page</a> from Penn State University explains some typical outputs from seismometers.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 1099974,
      "author_name": "amanjain1008",
      "author_url": "",
      "post_date": "12/02/2020 18:22:02",
      "content": "<p>time_to_eruption has none of the negative values </p>\n<p>and the sensors data is the vibrations captured by them so they can be negative and I suggest to do a frequency analysis to tackle them </p>\n<p><a href=\"https://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda\" target=\"_blank\">https://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda</a><br>\nrefer to my work here, see if it helps</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "1088299": "Why are some sensor times negative while others are positive? Should I make them all positive and use that or aggregate them as they are and have the result be the total time for that segment id. Maybe a newbie question but I am a newbie.\n\nThanks",
    "1098625": "The sensor readings are not times, they are positions on a wave.  Think of it like a sound wave, with roughly half the points above and half below the zero line.  [This notebook](https://www.kaggle.com/jesperdramsch/introduction-to-volcanology-seismograms-and-lgbm) includes a sample plot of some of the waves.  [This page](http://eqseis.geosc.psu.edu/cammon/HTML/Classes/IntroQuakes/Notes/seismometers.html) from Penn State University explains some typical outputs from seismometers.",
    "1099974": "time_to_eruption has none of the negative values \n\nand the sensors data is the vibrations captured by them so they can be negative and I suggest to do a frequency analysis to tackle them \n\nhttps://www.kaggle.com/amanjain1008/erupting-volcano-all-in-one-different-eda\nrefer to my work here, see if it helps"
  },
  "source": "meta"
}