A little explanation

Okay, some of the terms I use are a bit hard to understand. So, I'm going to explain them.
OBP: On base percentage. Read Moneyball. It counts walks and HBP. League Average is .330, good is .350, very good is .360 +, and great is .400. H+BB+HBP/AB+BB+HBP+SF
SLG: Slugging percentage. TB/AB or 1b+2*2b+3*3b+4*hr/ab
OPS: on base plus slugging. OBP+SLG. Correlates the most with scoring runs.
EqA: Equivalent Average. A stat developed by Clay Davenport of Baseball Propsectus, it is like OPS, except on a batting average scale.
EqR: Equivalent Runs. The run companion stat to EqA. Think of it like RBI.
Runs Created: Created by Bill James, the simple form is OBP*TB or OBP*SLG*PA where TB is total bases and PA is plate appearences. Think of it like RBI in the amount.
FIP: Fielding Independent Pitching, (13*hr+3*bb-2*k)/ip+3.2. On a ERA scale, measures what the ERA should be, defense and luck independent.
tRA: trure run average. Maybe the best way to measure pitchers. It is hard to explain here, but it basically measures what the pitchers ERA should be based on the amount of times a pitcher gives up a groundball, flyball, strikes someone out, gives up a line drive, home run, or walks someone. Each event is give a run value and out value. More here.