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。

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When determining empirical formula with test method, estimation value of estimated parameter in regression equation which is obtained with least square method always is a long number.

用实验方法确定经验公式时，回归方程中用最小二乘方法求得的待估参数的估计值往往是一个很长的数。

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There is a formula that applies to almost everything and it is called reversion to the mean, also regression to the mean.

有一个公式，适用于几乎所有的东西它被称为回归的意思，也均值回归。

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