Ah, figured out that part of my problem is that I don't have the GGPLOT library. Off to track that down.
Seriously, thanks again for this. You've started me exploring exactly the kind of thing I was hoping to get out of R in the first place. It's truly appreciated.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning