The stat issues points for postive accomplishments like retiring a batter or recording a strikeout, and deducts points for negatives like walks and hits allowed.
Mr. Obama complains in his budget that it's not fair that the rich get to deduct 35% for their mansions and charitable receipts, while the middle class deducts only 15% or 20%.
For example, it turns out that if you set up a system with your employer where the employer automatically deducts some of your paycheck and puts it into your 401(k) account, unless you say you don't want it done, it turns out people save more just naturally.