How do we think about how well our sample regression line fits our sample data?
我们怎样衡量我们的样本回归线拟合样本数据有多好呢？
Regression software programs graph the sample points and give the (cost-function) formula of the straight line that best fits the points.
回归软件程序将样本点用图表示，并且给出最拟合样本点的直线的价值函数公式。
The presented method is more accurate for using polynomial regression of theoretical calculated data as sample off-line and is quicker for the reason of its fixed polynomial pattern on-line.
该方法以有限个理论计算数据为样本，采用多项式函数离线进行回归，在保证高的逼近精度的前提下，以显著提高在线计算速度为目的。
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