MLB DG: The Difference in ERA & FIP
There are multiple articles in this guide talking about earned run average (ERA), and variations on that well-known measure. This is another measure that speaks to potential differences between what ERA says about a pitcher’s performance in 2017 and what a deeper look at that hurler's effort actually shows.
WHAT IS ERA?
It’s the measure we all know and love, the one we’ve learned how to understand since we were children. Directly from MLB.com.
Earned run average represents the number of earned runs a pitcher allows per nine innings -- with earned runs being any runs that scored without the aid of an error or a passed ball. ERA is the most commonly accepted statistical tool for evaluating pitchers.