Statistics(통계)

http://en.wikipedia.org/wiki/Mean
http://en.wikipedia.org/wiki/Skewness
http://en.wikipedia.org/wiki/Kurtosis
http://en.wikipedia.org/wiki/Moment_%28mathematics%29

http://en.wikipedia.org/wiki/Covariance
http://en.wikipedia.org/wiki/Correlation
http://en.wikipedia.org/wiki/Mutual_information