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Definition – What is Component Era?
ERC is a measurement of a pitcher’s ability. A lower ERC means that pitcher allows fewer runs.
ERC is an alternate form of Earned Run Average (ERA). It creates a pitcher’s earned run average from their hits and walks data. Traditional ERA which builds its results from the number of runs earned per 9 innings (or 6 or 7 innings depending on the baseball league).
Formula – How to Calculate ERC
In Baseball, Component ERA is calculated as:
PTB = (0.89 x ((1.255 x (Hits – Home Runs))) + (4 x Home Runs)) + (0.56 x (Walks + Hit by Pitch – Intentional Base on Balls))
Component ERA = ((((Hits + Walks + Hit by Pitch) x PTB)÷(Batters Faced by Pitcher x (Innings Pitched + (Outs (Partial Innings) Pitched ÷ 3))) x 9) – 0.56
Example
If pitcher has the following statistics:
Hits: 190 | Walks: 43 | Home Runs: 35 | Batters Hit: 2 | Intentional Walks: 4 | Batters Faced: 670 | Innings Pitched: 202 | Outs Pitched: 1
then:
PTB = (0.89 x ((1.255 x (190 – 35)) + (4 x 35)) + (0.56 x (43 + 2 – 4))
PTB = (0.89 x ((1.255 x 155) + 140) + (0.56 x 41)
PTB = (0.89 x (194.525 + 140)) + 22.96
PTB = (0.89 x 334.525) + 22.96
PTB = 297.72725 + 22.96
PTB = 320.68725
Component ERA = ((((190 + 43 + 2) x 320.68725)÷(670 x (202 + (1 / 3))) x 9) – 0.56
Component ERA = (((235 x 320.68725)÷(670 x 202.33333333)) x 9) – 0.56
Component ERA = ((75361.50375÷135563.333) x 9) – 0.56
Component ERA = (0.55591 x 9) – 0.56
Component ERA = 5.00 – 0.56
Component ERA = 4.44
Therefore, the pitcher’s Component ERA is 4.44.
Sources and more resources
- Wikipedia – Component ERA – Wikipedia entry on component ERA.
- Glossary entries on component ERA from Sporting Charts
- More on Component ERA with the Society for American Baseball Research – “The Many Flavors of DIPS: An History and Overview” and The Hardball Times – “How well can we predict ERA?”
- Rules on baseball and baseball statistics from Major League Baseball, NCAA (Baseball), NCAA (Softball), NCAA (Baseball and Softball), NFHS, and the International Baseball Federation.