September 2015
Beginner to intermediate
608 pages
13h 43m
English
Content preview from Clojure for Data Science
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Covariance
One way of quantifying the strength of the relationship between two variables is their covariance. This measures the tendency of two variables to change together.
If we have two series, X and Y, their deviations from the mean are:
Where xi is the value of X at index i, yi is the value of Y at index i, 
is the mean of X, and 
is the mean of
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.