1、回归方程是一种预测，但并未给出预测准确性的信息；

2、回归估计的标准误给出回归线和数据点之间标准距离的量度；

1. The regression equation is a prediction, but it does not give information about the accuracy of the prediction;

2, the standard error of regression estimation gives a measure of the standard distance between the regression line and the data point;

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1、首先计算误差和方（First calculate the error sum of squares）

SS_error=

2、将误差的和方除以自由度，开方

自由度为：df = n-2 Divide the sum of the errors by the degrees of freedom, square root

The degrees of freedom are: df = n-2

S_error=

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SS_error=(1 - r²) SS_Y