{
  "id": 348814,
  "title": "What am I missing?",
  "url": "/competitions/big-data-derby-2022/discussion/348814",
  "author_name": "",
  "post_date": "2022-08-30T04:38:47.721330100Z",
  "votes": 4,
  "comment_count": 3,
  "views": 0,
  "content": "<p>There are at least two kinds of strategies horses employ when racing: stride frequency and stride length. The speed of the horse is the stride frequency times the stride length. Small horses must increase their stride frequency to keep up with the horses with longer stride lengths. Different breathing/circulatory conditioning required for the two strategies.</p>\n<p>Average stride frequency for Thoroughbred horses at full gallop is about 2.34 strides per second. The trakus readouts occur every 0.25 seconds. This implies a Nyquist frequency of 2 strides per second. So it seems the readouts are not frequent enough to estimate stride frequency, and therefore we probably miss out on a potentially interesting feature. </p>\n<p>Am I missing something and there is a way to estimate the stride frequency from this data?</p>",
  "messages": [
    {
      "id": "1919038",
      "postDate": "08/30/2022 04:38:47",
      "content": "<p>There are at least two kinds of strategies horses employ when racing: stride frequency and stride length. The speed of the horse is the stride frequency times the stride length. Small horses must increase their stride frequency to keep up with the horses with longer stride lengths. Different breathing/circulatory conditioning required for the two strategies.</p>\n<p>Average stride frequency for Thoroughbred horses at full gallop is about 2.34 strides per second. The trakus readouts occur every 0.25 seconds. This implies a Nyquist frequency of 2 strides per second. So it seems the readouts are not frequent enough to estimate stride frequency, and therefore we probably miss out on a potentially interesting feature. </p>\n<p>Am I missing something and there is a way to estimate the stride frequency from this data?</p>",
      "rawMarkdown": "There are at least two kinds of strategies horses employ when racing: stride frequency and stride length. The speed of the horse is the stride frequency times the stride length. Small horses must increase their stride frequency to keep up with the horses with longer stride lengths. Different breathing/circulatory conditioning required for the two strategies.\n\nAverage stride frequency for Thoroughbred horses at full gallop is about 2.34 strides per second. The trakus readouts occur every 0.25 seconds. This implies a Nyquist frequency of 2 strides per second. So it seems the readouts are not frequent enough to estimate stride frequency, and therefore we probably miss out on a potentially interesting feature. \n\nAm I missing something and there is a way to estimate the stride frequency from this data?",
      "votes": null
    },
    {
      "id": "1919476",
      "postDate": "08/30/2022 12:48:59",
      "content": "<p>Yes, you will not be able to infer the stride length or frequency from this data. I already plotted the height of the detector as a function of time and there was no repetitive pattern that would indicate a stride frequency. All I could see was the way the track sloped one way or the other. You will have to look in other places to infer something from the data. </p>",
      "rawMarkdown": "Yes, you will not be able to infer the stride length or frequency from this data. I already plotted the height of the detector as a function of time and there was no repetitive pattern that would indicate a stride frequency. All I could see was the way the track sloped one way or the other. You will have to look in other places to infer something from the data.",
      "votes": null
    },
    {
      "id": "1923115",
      "postDate": "09/02/2022 02:34:53",
      "content": "<p>just curious: where did you get the height of the detector data? In the discussions somewhere?</p>",
      "rawMarkdown": "just curious: where did you get the height of the detector data? In the discussions somewhere?",
      "votes": null
    },
    {
      "id": "1926310",
      "postDate": "09/04/2022 18:28:09",
      "content": "<p>I just calculated it after transforming the lat log into x,y,z and then rotating the xyz axes so that the whole set of points is in a single plane. then i looked at variations from this plane. </p>",
      "rawMarkdown": "I just calculated it after transforming the lat log into x,y,z and then rotating the xyz axes so that the whole set of points is in a single plane. then i looked at variations from this plane.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 1919476,
      "author_name": "louisbunuel",
      "author_url": "",
      "post_date": "08/30/2022 12:48:59",
      "content": "<p>Yes, you will not be able to infer the stride length or frequency from this data. I already plotted the height of the detector as a function of time and there was no repetitive pattern that would indicate a stride frequency. All I could see was the way the track sloped one way or the other. You will have to look in other places to infer something from the data. </p>",
      "votes": null,
      "replies": [
        {
          "id": 1923115,
          "author_name": "pbarendse",
          "author_url": "",
          "post_date": "09/02/2022 02:34:53",
          "content": "<p>just curious: where did you get the height of the detector data? In the discussions somewhere?</p>",
          "votes": null,
          "replies": []
        },
        {
          "id": 1926310,
          "author_name": "louisbunuel",
          "author_url": "",
          "post_date": "09/04/2022 18:28:09",
          "content": "<p>I just calculated it after transforming the lat log into x,y,z and then rotating the xyz axes so that the whole set of points is in a single plane. then i looked at variations from this plane. </p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "1919038": "There are at least two kinds of strategies horses employ when racing: stride frequency and stride length. The speed of the horse is the stride frequency times the stride length. Small horses must increase their stride frequency to keep up with the horses with longer stride lengths. Different breathing/circulatory conditioning required for the two strategies.\n\nAverage stride frequency for Thoroughbred horses at full gallop is about 2.34 strides per second. The trakus readouts occur every 0.25 seconds. This implies a Nyquist frequency of 2 strides per second. So it seems the readouts are not frequent enough to estimate stride frequency, and therefore we probably miss out on a potentially interesting feature. \n\nAm I missing something and there is a way to estimate the stride frequency from this data?",
    "1919476": "Yes, you will not be able to infer the stride length or frequency from this data. I already plotted the height of the detector as a function of time and there was no repetitive pattern that would indicate a stride frequency. All I could see was the way the track sloped one way or the other. You will have to look in other places to infer something from the data.",
    "1923115": "just curious: where did you get the height of the detector data? In the discussions somewhere?",
    "1926310": "I just calculated it after transforming the lat log into x,y,z and then rotating the xyz axes so that the whole set of points is in a single plane. then i looked at variations from this plane."
  },
  "source": "meta"
}