Baseball Statistics
This a preliminary version of this page. I'll be adding to it,
and working on the format of the information, as time permits.
Offense
At Bat (AB) *** I added this explanation on 4/27/00 ***
AB does not include walks, hit by pitch, sacrifice bunts, sacrifice
flys, or being awarded firstbase due to catcher's interference. It
does include reaching firstbase on an error or fielders choice.
Batting Average (BA)
BA = H / AB
Where:
H = Hits
AB = At Bats
Total Bases (TB)
TB = 1B + (2 * 2B) + (3 * 3B) + (4 * HR)
Where:
1B = Singles
2B = Doubles
3B = Triples
HR = Homeruns
Slugging Average (SA)
SA = TB / AB
Where:
TB = Total Bases
AB = At Bats
On Base Average (OBA)
OBA = (H + BB + HBP ) / (AB + BB + HBP + SF)
Where:
H = Hits
BB = Bases on Balls
HBP = Hit by Pitch
AB = At Bats
SF = Sacrifice Flies
On Base Plus Slugging Average (OPS)
OPS = OBA + SA
Where:
OBA = On Base Average
SA = Slugging Average
Bases per Plate Appearance (BPA)
This measure accounts for the net bases accumulated by a player per plate
appearance. It considers both hitting and base running. It is calculated
as follows:
BPA = (TB + BB + HBP + SB - CS - GIDP) / (AB + BB + HBP + SF)
Where:
TB = Total Bases
BB = Bases on Balls
HBP = Hit by Pitch
SB = Stolen Bases
CS = Caught Stealing
GIDP = Grounded into Double Plays
AB = At Bats
SF = Sacrifice Flies
Pitching
Earned Run Average (ERA) **** I corrected this on 3/15/00 ****
ERA = (ER * IPG) / IP
Where:
ER = Earned Runs Allowed
IP = Innings Pitched
IPG = Innings Played in a "Normal" Game (this would be 9
for major league, 7 for high school, etc.)
Walks Plus Hits per Inning (WHIP)
WHIP = (BB + H) / IP
Where:
BB = Bases on Balls (Walks) Allowed
H = Hits Allowed
IP = Innings Pitched