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？

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In general, sample data in regression analysis often contain noise.

在回归分析中，样本数据通常含有噪声。

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In general, sample data in regression analysis often contain noise.

在回归分析中，样本数据通常含有噪声。

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