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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.lootmeister.com/mlb/good-bad-era.php

Examples of what constitues both good and bad earned run average for Major League Baseball pitchers. ... MLB Betting: How to Judge a Pitcher's ERA ... A closer might be expected to have a lower ERA, but for the most part, an ERA of 3.00 is ...

www.baseballhq.com/glossary-c-k

This sabermetric glossary is reprinted in its entirety from the 2008 Baseball Forecaster. ... A hitter's batting average as calculated by multiplying the percentage of balls put ... "xERA represents the expected ERA of the pitcher based on a normal ...

www.homerunweb.com/era.html

How to Calculate Earned Run Average (ERA) As the basic statistical measure ... So, for example, a pitcher with a 3.50 ERA is expected to allow three and a half ...

www.fangraphs.com/library/pitching/xfip

Expected Fielding Independent Pitching (xFIP) is a regressed version of Fielding ... It's calculated in the same way as FIP, except it replaces a pitcher's home run total with an estimate .... Better with Less: ERA Estimators – Baseball Prospectus.

www.baseball-reference.com/bullpen/Pythagorean_Theorem_of_Baseball

Feb 20, 2015 ... There are two ways of calculating Pythagorean Winning Percentage (W%). ... The average difference between the actual and the Expected W-L is a bit ... its application is limited to a specific era of baseball, and the slope (the ...

www.baseball-reference.com/about/war_explained_pitch.shtml

The pitcher's expected runs allowed is then the sum of his opposition's run ... In the current MLB environment, relievers have much lower ERAs than starters.

www.insiderbaseball.com/blog/2012/02/expected_era_winners_and_losers_from_a_season_ago.html

Feb 2, 2012 ... Expected ERA is a term coined by 2 stat researchers (Gill and Reeve), who developed the following mathematical formula ((.575 * H/9 ) + (.94 ...

www.beyondtheboxscore.com/2012/9/14/3332194/era-plus-vs-era-minus

Sep 14, 2012 ... What's the difference between ERA+ and ERA-, and why does it matter? ... at Baseball-Reference, and ERA-, an advanced statistic that can be found at .... that ERA+ can be used, relatively easily, to calculate an expected W%.