Moved to kohei dictionary and made small fix
Allows to filter words
This pmi is wrong but works well..
just a wrapper of SnowballC
It seems to be able to generate the same scores as Wordsmith
Some comments about WS was added
Some changes
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
dfm_bigtable was added, but it does not look good in terms of memory usage.