Quote:
Originally Posted by Topnotchsy
ERA tells the number of runs but not when they were given up. Not every run affects the outcome of the game the same. If we accept the idea that some people fold under pressure and others rise to the occasion, 2 people won’t the same ERA may be diifferent in how likely their team is to win.
A stat calculating win probability and the pitchers impact on it each time they give up a run could he’d light. I assume this exists somewhere...
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Yeah. There's a stat for that.
Win Probability Added (WPA) captures the change in Win Expectancy from one plate appearance to the next and credits or debits the player based on how much their action increased their team’s odds of winning. Most sabermetric statistics are context neutral — they do not consider the situation of a particular event or how some plays are more crucial to a win than others. While wOBA rates all home runs as equal, we know intuitively that a home run in the third inning of a blowout is less important to that win than a home run in the bottom of the ninth inning of a close game. WPA captures this difference.