"regression to the mean" meaning in English

{
  "forms": [
    {
      "form": "regressions to the mean",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "regression toward the mean",
      "tags": [
        "alternative"
      ]
    }
  ],
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      "expansion": "regression to the mean (plural regressions to the mean)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
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            "Entries with incorrect language header",
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          "name": "Statistics",
          "orig": "en:Statistics",
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            "Mathematics",
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            "Fundamental"
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        }
      ],
      "glosses": [
        "The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents."
      ],
      "id": "en-regression_to_the_mean-en-noun-YoGbd7cq",
      "links": [
        [
          "statistics",
          "statistics"
        ]
      ],
      "raw_glosses": [
        "(statistics) The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents."
      ],
      "related": [
        {
          "word": "regression fallacy"
        },
        {
          "word": "linear regression"
        },
        {
          "word": "regression line"
        }
      ],
      "topics": [
        "mathematics",
        "sciences",
        "statistics"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "statistical phenomenon",
          "word": "regressio kohti keskiarvoa"
        }
      ]
    }
  ],
  "word": "regression to the mean"
}

{
  "forms": [
    {
      "form": "regressions to the mean",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "regression toward the mean",
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        "alternative"
      ]
    }
  ],
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "regression fallacy"
    },
    {
      "word": "linear regression"
    },
    {
      "word": "regression line"
    }
  ],
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      "glosses": [
        "The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents."
      ],
      "links": [
        [
          "statistics",
          "statistics"
        ]
      ],
      "raw_glosses": [
        "(statistics) The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents."
      ],
      "topics": [
        "mathematics",
        "sciences",
        "statistics"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "statistical phenomenon",
      "word": "regressio kohti keskiarvoa"
    }
  ],
  "word": "regression to the mean"
}