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Tweaks.

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1 parent 4335b36 commit b1843be3f29610ffd7a3f99962a1dc5353b39ea6 @echen committed Feb 9, 2012
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@@ -134,7 +134,7 @@ So let's go back to calculating the correlation between movie and movie2. We cou
But recall that we can also write correlation in the following form:
-$Corr(X, Y) = (n \sum xy - \sum x \sum y) / (sqrt[n \sum x^2 - (\sum x)^2] sqrt[n \sum y^2 - (\sum y)^2])$
+$$Corr(X, Y) = \frac{n \sum xy - \sum x \sum y}{\sqrt[n \sum x^2 - (\sum x)^2] \sqrt[n \sum y^2 - (\sum y)^2]}$$
(See the [Wikipedia page](http://en.wikipedia.org/wiki/Correlation_and_dependence) on correlation.)

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