mathgeek
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What does correlation formula really tell you?
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Let's rewrite this formula as follows: $$\begin{align} \mathrm{corr} \left(\vec x, \vec y\right) = \frac{\sum \left(x_i - \bar x\right)\left(y_i - \bar y\right)}{\sqrt{\sum\left(x_i - \bar x\right)^2}\...

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