SoSH Glossary: Adjusted ERA+

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SoSH Baseball Glossary

Baseball is filled with statistics, rules, and archaic terms that can often form what sounds like a foreign language. Sons of Sam Horn’s glossary provides a better understanding of these terms through straightforward definitions, clear explanations, and examples pulled straight from the baseball world. If there is anything you would like us to add to our glossary, please contact us.

Adjusted ERA+

Adjusted ERA+, or more commonly ERA+, normalizes ERA across leagues while accounting for park factors. The resulting number is then multiplied by 100.  The statistic yields a value which (unlike regular ERA) increases with effectiveness: any pitcher with an ERA+ above 100 allowed fewer earned runs than the league average, while any pitcher with an ERA+ below 100 allowed more earned runs than the league average.

ERA+ allows us to compare the Chicago White Sox’ Chris Sale, who in 2015 recorded a 173 ERA+ in U.S. Cellular Field, with the 1985 season of Dwight Gooden of the New York Mets, who produced an obviously superior 268 ERA+ in Shea Stadium.

What’s The Catch?

The issue with ERA+ is that it relies on earned runs, which the pitcher can not always influence. Scorers’ decisions, defense, the effectiveness of his team’s relievers, and even poor managerial decisions (shifts, intentional walks, pitchouts, etc.) can hurt a pitcher’s ERA.

Pete Hodges has written about the call up of a top prospect, an odd tradition, and Leo the Lip.

Follow Pete on Twitter @PeterWHodges.

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