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en.wikipedia.org/wiki/Earned_run_average

In baseball statistics, earned run average (ERA) is the mean of earned runs given up by a ... pitchers' defensive errors) are recorded as unearned runs and omitted from ERA calculations. ... Prior to 1900 – and, in fact, for many years afterward – pitchers were routinely expected to pitch a complete game, and their win-loss ...

captaincalculator.com/sports/baseball/era-calculator

Earned Run Average (ERA) is a baseball metric used put a pitcher's number of ... win/loss ratio (primarily because pitchers were expected to pitch a full game).

www.insiderbaseball.com/blog/2010/02/fantistics_blog_2202010_expected_era_xera.html

Feb 20, 2010 ... Expected ERA is a term coined by 2 stat researchers (Gill and Reeve), which developed the following mathematical formula ((.575 * H/9 ) + (.94 ...

www.betfirm.com/pitching-luck-with-fluke-wins-xera-vs-actual-era

Overlooked MLB Stats: xERA vs Actual ERA & Pitching Luck vs Fluke Wins ... That is why I want to take some time to explain two different methods of determining how a starting pitcher will perform on a given start. Expected ERA ( xERA) vs.

www.fangraphs.com/library/pitching/xfip

Expected Fielding Independent Pitching (xFIP) is a regressed version of Fielding Independent .... Better with Less: ERA Estimators – Baseball Prospectus.

www.lootmeister.com/mlb/era.php

how to calculate era, pitcher, record, earned run average, whip, stat, walks, hits ... Depending on the type of era the baseball is taking place, an effective ERA can ... Pitching only one inning, they are expected to have a low earned run average.