Point-wise Mutual Information
https://web.stanford.edu/~jurafsky/slp3/15.pdf
Measure of association good for words used for collocation extraction
PMI PPMI
Additive smoothing
https://svn.spraakdata.gu.se/repos/gerlof/pub/www/Docs/npmi-pfd.pdf
https://web.stanford.edu/~jurafsky/slp3/15.pdf
Measure of association good for words used for collocation extraction
PMI PPMI
Additive smoothing
https://svn.spraakdata.gu.se/repos/gerlof/pub/www/Docs/npmi-pfd.pdf