Logical Grouping, a query from Rod Fitzsimmons Frey
I'm looking for some advice from the statisticians. I'm interested in taking an open set of email messages and finding logical groups. There are obvious ways to group them, including recipient lists, subject lines, etc. but what I'd really like to do is find sets based on the message content. What branch of statistics or area of research should I investigate to find some trailheads?