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"## 相关分析\n",
"**相关分析**\n",
"<ul>\n",
" <li>衡量事物之间或称变量之间线性相关程度的强弱，并用适当的统计指标表示出来的过程。\n",
" <li>比如，家庭收入和支出、一个人所受教育程度与其收入、子女身高和父母身高等"
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"**相关系数**\n",
"<ul>\n",
" <li>衡量变量之间相关程度的一个量值。\n",
" <li>相关系数r的数值范围是在-1到+1之间。\n",
" <li>相关系数r的正负号表示变化方向。\"+\"号表示变化方向一致，即正相关:“-”号表示变化方向相反，即负相关。\n",
" <li>r的绝对值表示变量之间的密切程度(即强度)。绝对值越接近1， ； ，
" <li>相关系数的值,仅仅是一个比值。它不是由相等单位度量而来(即不等距)，也不是百分比，因此，不能直接作加、减、乘、除运算。\n",
" <li>相关系数只能描述两个变量之间的变化方向及密切程度,并不能揭示两者之间的内在本质联系,即存在相关的两个变量,不一定存在因果关系。\n",
"</ul>\n",
"<img src=\"assets/20201119224526.png\" width=\"50%\">"
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"左上图是线性相关最低的，右上图是线性相关很明显的；\n",
"左下图是线性相关一般的，右下图有一定的相关但不是线性相关；"
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