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Plan of attack

Alignment measure: which measure to use (see related papers)? if we stick to the current one, eliminate identical n-grams?
Prototypical language: test the hypothesis that central members use language that is more prototypical of the community. Following the approach in No country for old members, we could train a language model on the corpus and check whether cross-entropy of users' messages correlates with their centrality.
Going dynamic: adding the temporal dimension. By breaking up the corpus into time slices, we could investigate:
- how users become central over time, and connection with adminship.
- whether users progressively adopt the prototypical language of the community from the point they join in, or from the moment they become admins.