"Sørensen-Dice coefficient" meaning in English

{
  "etymology_text": "Developed independently by the botanists Thorvald Sørensen and Lee Raymond Dice in the 1940s.",
  "forms": [
    {
      "form": "Sørensen–Dice coefficient",
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      "form": "Sørensen-Dice coefficients",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A statistic used to gauge the similarity of two samples. It is equal to twice the number of elements common to both sets, divided by the sum of the number of elements in each set."
      ],
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      "raw_glosses": [
        "(statistics) A statistic used to gauge the similarity of two samples. It is equal to twice the number of elements common to both sets, divided by the sum of the number of elements in each set."
      ],
      "synonyms": [
        {
          "word": "Dice coefficient"
        },
        {
          "word": "Dice's coefficient"
        },
        {
          "word": "Sørensen-Dice index"
        },
        {
          "word": "Sørensen index"
        }
      ],
      "topics": [
        "mathematics",
        "sciences",
        "statistics"
      ],
      "wikipedia": [
        "Lee R. Dice",
        "Thorvald Sørensen"
      ]
    }
  ],
  "word": "Sørensen-Dice coefficient"
}

{
  "etymology_text": "Developed independently by the botanists Thorvald Sørensen and Lee Raymond Dice in the 1940s.",
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    {
      "form": "Sørensen–Dice coefficient",
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      "glosses": [
        "A statistic used to gauge the similarity of two samples. It is equal to twice the number of elements common to both sets, divided by the sum of the number of elements in each set."
      ],
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        "(statistics) A statistic used to gauge the similarity of two samples. It is equal to twice the number of elements common to both sets, divided by the sum of the number of elements in each set."
      ],
      "synonyms": [
        {
          "word": "Dice coefficient"
        },
        {
          "word": "Dice's coefficient"
        },
        {
          "word": "Sørensen-Dice index"
        },
        {
          "word": "Sørensen index"
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}