{
  "id": "M028",
  "type": "多选题",
  "type_code": "multiple",
  "stem": "设Y为被解释变量，X为解释变量，用最小二乘法拟合回归方程时，其基本原理是使（ ）。",
  "stem_text": "设Y为被解释变量，X为解释变量，用最小二乘法拟合回归方程时，其基本原理是使（ ）。",
  "options": [
    {
      "key": "A",
      "text": "[[IMG:13_image17.png]] 最小"
    },
    {
      "key": "B",
      "text": "[[IMG:13_image18.png]]最小"
    },
    {
      "key": "C",
      "text": "[[IMG:13_image19.png]]最小"
    },
    {
      "key": "D",
      "text": "[[IMG:13_image20.png]]最小"
    },
    {
      "key": "E",
      "text": "各观测值到回归直线的纵向距离平方和最小"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "[Σ(Yᵢ − Ȳ)²] 最小"
    },
    {
      "key": "B",
      "text": "[Σ(Xᵢ − X̄)²]最小"
    },
    {
      "key": "C",
      "text": "[Σ(Yᵢ − Ŷᵢ)²]最小"
    },
    {
      "key": "D",
      "text": "[Σ(Xᵢ − X̂ᵢ)²]最小"
    },
    {
      "key": "E",
      "text": "各观测值到回归直线的纵向距离平方和最小"
    }
  ],
  "answer_keys": [
    "C",
    "E"
  ],
  "answer_display": "CE",
  "answer_texts": [
    "[Σ(Yᵢ − Ŷᵢ)²]最小",
    "各观测值到回归直线的纵向距离平方和最小"
  ],
  "sources": [
    {
      "edition": "第13届",
      "edition_num": 13,
      "no": 72,
      "uid": "13-072",
      "file": "第13届市调大赛本科组模拟题.docx"
    },
    {
      "edition": "第15届",
      "edition_num": 15,
      "no": 71,
      "uid": "15-071",
      "file": "第15届市调大赛本科组模拟题1.docx"
    }
  ],
  "source_display": "第13届 第72题、第15届 第71题",
  "source_count": 2,
  "images": [
    "13_image17.png",
    "13_image18.png",
    "13_image19.png",
    "13_image20.png",
    "15_image10.png",
    "15_image7.png",
    "15_image8.png",
    "15_image9.png"
  ],
  "warnings": [],
  "conflict": null,
  "url": "/q/M028.html"
}