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update README.md.

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Signed-off-by: taishan <liuyapeng@bdtd.com>
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#### 皮尔森(pearson)相关系数公式 #### 皮尔森(pearson)相关系数公式
![输入图片说明](https://images.gitee.com/uploads/images/2020/0731/193612_8dfc4af8_1981977.png "屏幕截图.png") ![输入图片说明](1675762046093.png)
公式定义为： 两个连续变量(X,Y)的pearson相关性系数(Px,y)等于它们之间的协方差cov(X,Y)除以它们各自标准差的乘积(σX,σY)。系数的取值总是在-1.0到1.0之间，接近0的变量被成为无相关性，接近1或者-1被称为具有强相关性。 公式定义为： 两个连续变量(X,Y)的pearson相关性系数(Px,y)等于它们之间的协方差cov(X,Y)除以它们各自标准差的乘积(σX,σY)。系数的取值总是在-1.0到1.0之间，接近0的变量被成为无相关性，接近1或者-1被称为具有强相关性。