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“Having heard without comprehension they are like the deaf; this saying bears witness to them: present they are absent.’’ — Heraclitus

学而不思则罔。 —孔子

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有些人好像是真的有一种宿命感,早早地碰到一件事情就知道,我就是要做这个的。

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If we know it’s a linear relationship: given correlation, var of x, var of y, we can deduce that $y=\beta x+\epsilon$.

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