Not sure I can point you to the exact book, but maybe one on simple division. He took 50 less 3 pointers. (and had other shooting threats around him, stopped acting like he was the next messiah, etc. etc.)
I think like most people on this thread, I agree Tracy isn't going to be a 50% or most likely 40% shooter--whether it be from 2 or 3.
And yes, Rice did take less shots, he became more selective and took better opportunists. Maybe he didn't become a 'better' 3 pt shooter in terms of pure skill, but he got smarter about when and how he took those shots. In my mind, that makes him a better 3 pt shooter (I'd rather have someone take a higher percentage if they aren't sure they'll make the 3).
Abrams has taken a lot of completely open threes, mostly hitting all of them, that'll change as competition increases, but he isn't forcing them up. In the end of the season, its hard to imagine his shooting percentage regresses back to that of his career average. Not only does his shot look better, but he's absolutely taking care of the ball better in terms of correctly utilizing his touches, whether it be driving or dishing, instead of taking low percentage shots.
So, TA isn't going to shoot 50%. Anyone who thinks that is crazy. However, he is going to be a better player than he was before, at least in the shooting column of the stats sheet. His BBIQ has increased. So maybe to you, he's improvement is a mirage due him taking less shots, but having a higher percentage, ala Rice.
Regardless, you cant really argue he isn't one of our best 5 players, as of now. Maybe when conference play picks up, JCL will come into his own, taking some of TA minutes away. TA has always been an undersized combo guard. On our team he looks like a great ball handler and floor general, which he isn't--not saying he can't do both, but his skills are much more suited for the 2. When you play TA instead of JCL at the 2, its very close to playing 2 PG's, which is what Groce wants to run.
Side note: Does anyone remember Tracy throwing up 2 to 3 teardrop shots every game before injury (and mostly missing them)? Maybe my memory is fuzzy cause I hated watching him do that... but I dont think hes tried more than 2 all this year, which makes him look like a better player if you ask me