Editing Cluster analysis (section)

==== [[Mutual Information]] ====
The mututal information is an [[information theory|information theoretic]] measure of how much information is shared between a clustering and a ground-truth classification that can detect a non-linear similarity between two clusterings. [[Adjusted mutual information|Normalized mutual information]] is a family of corrected-for-chance variants of this that has a reduced bias for varying cluster numbers.<ref name="pfitzner" />