Question about data

I'm hoping that someone can point me towards the data model documentation at GitHub.  I'd like to know what data is available.  In particular, what data items are available for the discussion posts and responses.  I'm thinking about using it in my school and want to do an analysis of each post and response.  For example, I'd like to know (1) how many responses each user makes to a post? (2) how long does it take each user to first respond to a post?  (3) which users respond most to other users?  (4) which users don't respond to other users?  And so on...