直线回归是处理两变量线性依存关系的一种统计分析方法。依据每对观察值，按最小二乘法原理，求得一直线方程：ｙ＝ａ＋ｂｘ。其中ａ为直线在ｙ轴上的截距；ｂ为直线的斜率，即回归系数。ｂ的意义为自变量ｘ每变化一个单位，因变量ｙ平均改变的单位数。一般认为所求直线回... Linear regression is a statistical analysis method that deals with the linear dependence of two variables. According to each pair of observations, according to the principle of least squares, the straight line equation is obtained: y=a+bx. Where a is the intercept of the line on the y-axis; b is the slope of the line, which is the regression coefficient. The meaning of b is the unit number for which the dependent variable y changes on average for each unit of independent variable x. It is generally believed that the requested line is back...