Comparing pitchers'ERA from the two major leagues, one should consider the role played by the designated hitter in the American league, surely a much tougher ninth batter to face than the weak,...
Earned Run Average distorts the contribution of pitchers in multiple ways, yet it is still widely used. Until everyone gets on board with a Runs Allowed scale, here are the easy conversions.
This is based on nearly 1,000 cases since 1999. Essentially it's baserunners per nine rankings of pitchers with at least 150 innings in that season and the correlation to their ERA. I included...
