This item describes the defense rate of baseball pitchers. For the defense rate of goalkeepers such as soccer and ice hockeyDefense rate (goalkeeper)."

Defense rate(Bougoritsu, Earned Run Average / ERA)baseball,cricketAnd so onpitcherGave in the prescribed inningsSelf-responsibilityIs the average value of.

The lower the earned run, the lower the value, so the lower the value, the better.

Overview

Calculate with the following formula.

• Earned run average = earned run x 9 ÷ innings pitched

The ERA is the pitcher's earned run equivalent to one game (1 innings).For pitching timesfraction(1⁄3,2⁄3) Is included in the calculation, including not only the integer part but also the fractional part.In general, round off the third decimal place of the number calculated by the above formula and display the values ​​up to the second decimal place (if it is divisible by the second place, fill the remaining digits with 3).When displaying the ERA in the ranking, if there are two or more pitchers who have the same value up to the second decimal place but different values, it will be displayed until the third decimal place and later have different values. do.

If the pitcher is replaced while leaving the runner in the middle of the inning, the runner's score will be the pitcher before the replacement.GoalAnd recorded as self-responsibility (with exceptions.Self-responsibilitySee also).Therefore, the relief pitcher may not reflect the actual situation in the apparent ERA (for example, even if the ERA is 0.00, the runner allowed by the pitcher before the change may be scored), and the ERA may be scored. It is difficult to evaluate.

The team ERA can also be calculated by the above formula.In that case, replace "earned run" and "innings pitched" with "earned run of the team" and "innings pitched by the team", respectively.However, the earned run value of a team may differ from the total earned run of all pitchers on that team (Self-responsibilitySee also).On the other hand, for the pitching times of the team, the total value of the pitching times of all pitchers is used as it is.

Remarks

The above definition formula only expresses the definition accurately, but the division is to be performed first.For this reason, before the spread of calculators, in order to simplify the calculation, the fractional part of the pitching times was used.RoundingThere is a time when I calculated it after converting it to an integer. In addition, a formula was also officially calculated in which the self-reliance point was divided by the number of pitches, rounded off, and then multiplied by 9. Therefore, it should be noted that past player records may be official records that are different from the values ​​calculated by the current regulations.

Japanese professional baseballThen,1983/から

• Defensive rate = (self responsibility x 9 x 3) ÷ (throw times x 3)

The ERA is now defined by the formula.Earned run 53, pitching times 1932⁄3In the case of, the ERA is 2.46.

Before that, the calculation formulas differ depending on the period, such as rounding up to 1963 and rounding up from 1964 to 1982. Is supposed to calculate.

Due to the calculation method, pitchers with self-responsibility that can only take a small out may have a large defensive rate of 50 or more, or rarely 100 or more.Yutaka OnoHas an ERA of 1 (innings pitched) in the first professional season (1977)1⁄3, There is an example of recording an earned run 5).

In addition, pitchers who could not get any outs have 1 pitches (on record).0⁄3), So the ERA cannot be calculated (Division by zeroBecause it becomes).In this case, instead of a number, it is written with some kind of symbol such as a horizontal line (the ERA may be regarded as "infinity" and set as "∞").

Japanese professional baseball

Best defense rate

Personal total record

• At the end of the 2021 season. 2000 pitches or more^[1].

Personal season record

Reference record

Major league baseball

Best defense rate

Personal total record

• See Baseball Reference^[3], Recorded at the end of 2021

Personal season record

• Since 1901, more than the specified number of pitches in each year

footnote

Related item

• Score coverage
• Catcher's ERA
• Various records of baseball