"Spearman's rank correlation coefficient" meaning in English

{
  "etymology_text": "Created by Charles Spearman.",
  "forms": [
    {
      "form": "Spearman's rank correlation coefficients",
      "tags": [
        "plural"
      ]
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  ],
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      "expansion": "Spearman's rank correlation coefficient (plural Spearman's rank correlation coefficients)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A statistical measure that expresses two variables by correlation on a scale from 1 to -1."
      ],
      "id": "en-Spearman's_rank_correlation_coefficient-en-noun-X2RTOmcr",
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        [
          "measure",
          "measure"
        ],
        [
          "variable",
          "variable"
        ],
        [
          "correlation",
          "correlation"
        ],
        [
          "scale",
          "scale"
        ]
      ],
      "wikipedia": [
        "Charles Spearman",
        "Spearman's rank correlation coefficient"
      ]
    }
  ],
  "word": "Spearman's rank correlation coefficient"
}

{
  "etymology_text": "Created by Charles Spearman.",
  "forms": [
    {
      "form": "Spearman's rank correlation coefficients",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "Spearman's rank correlation coefficient (plural Spearman's rank correlation coefficients)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "A statistical measure that expresses two variables by correlation on a scale from 1 to -1."
      ],
      "links": [
        [
          "statistical",
          "statistical"
        ],
        [
          "measure",
          "measure"
        ],
        [
          "variable",
          "variable"
        ],
        [
          "correlation",
          "correlation"
        ],
        [
          "scale",
          "scale"
        ]
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        "Charles Spearman",
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      ]
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}