Sunday, May 07, 2006
IR, IRS, and IRI
A relief pitcher's stats are not fully complimenting their actual effectiveness. For example, if Mariano Rivera takes the mound with a runner on third thanks in part by Kyle Farnsworth, the runner becomes Farnsworth's baby. I'm not saying that Farnsworth is a bad pitcher, but just for example. So, Rivera takes the mound, and allows the runner to score. Rover does not get charged with the run, Farnsworth does. Thanks a lot Mo. The run does not appear on Rivera's track record, all they see is the microscopic ERA.
Now, if we add a couple stats, Rivera's record would match his effectiveness more.
I have decided, and others in the stat department, that relief pitchers should have inherited runners and inherited runners scored statistics.
What is that? Keep reading.
Inherited runners are runners that are left on the bases when a new pitcher comes into the game. So, when Farnsworth leaves a runner on third, Rivera ges charged with one inherited runner, or IR for short.
IRI, or inherited runner innings, are the total amount of innings with IR. As confusing as this sounds, an IRI is when a pitcher enteres the game with an IR and is usually charged with as many 1/3 innings till all IRs are retired. Still confused. The runner on third is Rivera's IR. If Rivera enters the game late in the eighth, 8 1/3rd of the innings, he has 2/3 innings to either reitre that batter, or allow him to score. The runner scores with one out left in the inning, or in this case 1/3 inning after Rivera enters the game. So, River pitched 1/3 IRI. If you are more confused, stop reading, it get's worse.
Inherited runners scored, or IRS, is the equvilent of the earned run average, or ERA. if Rivera allowes that runner to score, he gets dinged on his IRS, but not his ERA as the rules say. The equation to calculate IRS is the same as the ERA. To figure out the ERA of a pitcher, divide his earned runs by innings pitched and mulitply by 100, or vise verca, one of those.
to calculate the IRS, divide the IR by his total IRI. So, when Rivera allowed the IR to score after 1/3 IRI, his IRS becomes 27.00. It appears high, but after some more IRI and less IRS, his IRI will lower. After the IR scores or is retired, all other runs and hits are calculated in the current pitchers stats.
These new stats should properly project a more accurate effectiveness of a relief pitchers. If you understood all this crap, then we can be best friends, if you are still confused, oh well, you should have stopped reading when I told you.
For a complete chart listing of pitchers preventing and allowing IR from 2003, click here
Posted by Steve Kenul at 6:24 PM
Cathie posted at 10:12 PM
Oh, what pain to encounter such evil on the blogosphere! May the hated Yankees lose their next 100 games!
;)
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