Opie S is a statistic used in baseball to measure the number of outs a pitcher records while facing the minimum number of batters. It is an acronym derived from the phrase “Out-per-Inning Efficiency Statistic”. The Opie S statistic is used to measure a pitcher’s efficiency in terms of the number of outs they record in an inning. It is a useful metric for evaluating pitchers and can be used to compare their performance against other pitchers.

## History of the Opie S Statistic

The Opie S statistic was first developed in the early 1990s by baseball statisticians Bill James and David Grabiner. The statistic was created in response to the increasing popularity of the “Earned Run Average” (ERA) statistic. The ERA statistic was widely used to evaluate pitchers, but it was criticized for being too general and not providing an accurate measure of a pitcher’s individual performance. James and Grabiner wanted to develop a statistic that would better measure a pitcher’s efficiency in terms of the number of outs they record in an inning.

The idea behind the Opie S statistic is that it measures the number of outs a pitcher records while facing the minimum number of batters. This allows for a more accurate assessment of a pitcher’s performance since the number of outs they record is directly related to the number of batters they face.

## Calculating the Opie S Statistic

The Opie S statistic is calculated by dividing the number of outs a pitcher records in an inning by the number of batters they face. The formula for calculating the Opie S statistic is as follows:

## Opie S = Number of Outs/Number of Batters Faced

For example, if a pitcher records 3 outs while facing 5 batters, the Opie S statistic would be calculated as follows:

## Opie S = 3/5 = 0.6

The higher the Opie S statistic, the more efficient a pitcher is in terms of the number of outs they record in an inning.

## Interpreting the Opie S Statistic

The Opie S statistic is typically used to compare pitchers against each other. Generally, a pitcher with a higher Opie S statistic is considered to be more efficient than a pitcher with a lower Opie S statistic.

For example, if a pitcher has a 0.8 Opie S statistic, this means that they are recording 4 outs for every 5 batters they face. This is considered to be very good and is usually indicative of an efficient pitcher.

On the other hand, if a pitcher has a 0.4 Opie S statistic, this means that they are only recording 2 outs for every 5 batters they face. This is considered to be very inefficient and is usually indicative of an ineffective pitcher.

## Conclusion

The Opie S statistic is a useful metric for evaluating pitchers in baseball. It measures the number of outs a pitcher records while facing the minimum number of batters and can be used to compare their performance against other pitchers. The higher the Opie S statistic, the more efficient a pitcher is in terms of the number of outs they record in an inning.