Baseball Statistcs

Offensive Definitions

Question	Answer
At bat	plate appearance (excluding walks, hit by pitches, and sacrifices)
Hit	1st base is reached (excluding fielding errors or fielder's choice)
Run	reaching home safely
RBI (Run batted in)	scoring a run due to the batters action
Home run	hit with all four bases touched (without error)
Batting average	hits divided by at bats (traditional measure of batting ability)
Stolen base	advancing to the next base entirely due to the runner's own efforts
Caught stealing	tagged out while attempting to steal a base
	memorize

Pitching Definitions

Question	Answer
Wins	games where pitcher was pitching while his team took a lead (that it never relinquished, going on to win)
Losses	games where pitcher was pitching while the opposing team took a lead (that it never relinquished, going on to win)
Saves	games where the pitcher enters a game led by the pitcher's team, finishes the game without surrendering the lead, is not the winning pitcher**
Innings pitched	outs recorded while pitching divided by three
Strikeouts	times pitching three strikes to a batter
Winning percentage	wins divided by decisions (wins plus losses)
Earned run average (ERA)	runs allowed, (excluding those resulting from fielding errors, per nine innings pitched)
	memorize

 

** either (a) the lead was three runs or less when the pitcher entered the game; (b) the potential tying run was on base, at bat, or on deck; or (c) the pitcher pitched three or more innings

Fielding Definitions

Question	Answer
Putouts	times the fielder catches a fly ball, tags or forces out a runner, or otherwise directly effects an out
Assists	times a putout by another fielder was recorded following the fielder touching the ball
Errors	times the fielder fails to make a play (that should have been made with common effort, and the batting team benefits as a result)
Total chances	putouts plus assists plus errors
Fielding average	successful chances (putouts plus assists) divided by total chances
	memorize

Source

http://en.wikipedia.org/wiki/Baseball