Tristan H. Cockcroft looks at the different factors that can affect earned run average, and why ERA is often not a great stat for projecting future performance.

SIERA is an ERA estimator that holds pitchers accountable for the types of batted balls they allow; SIERA relies heavily on a pitcher's strikeout%2C walk and ground-ball rates ...

PEORIA, Ariz. – There are days early in spring training when the pitchers are ahead of the hitters. Other days the hitters are ahead of the pitchers. So far, everyone has been ahead of the ...

When the 2009 season started, it looked like the Yankees would run away with the AL East with their lineup of hitters and pitchers. Now, with the season nearly an eighth of the way through, Alex ...

The correlation between ERA and UERA was 0.36 — not overwhelming, but pretty strong. That means that pitchers who are good at preventing earned runs are also generally good at preventing unearned runs ...