We use park factors to convert the opponent scoring to a league-average context.For in progress seasons, we consider the teams last 365 days.Previously, this was part of our replacement level calculation, but it has now been moved into Runs Above Avg."Park Factor customized for parks the pitcher threw in From 1918 on, we have full gamelogs, so we can say exactly how many innings a pitcher threw in each park.These are 3-year park factors weighted by batters faced in each park.Interleague road games are excluded from the avg, and when the pitcher faces an interleague opp at home, we modify the opponent run scoring by .20 runs per 9inning depending on whether the DH is added or removed from their lineup.We assume a league average pitcher would allow this many runs."Runs per 9 IP of support from defense This is based on the teams Total Zone Rating pre-2003 and Baseball Info Solutions Defensive Runs Saved since.The recentering forces the league sum to 0 which is as it should be for Wins Above Average.So for the league as a whole, WAA WAAWins Above Replacement for Pitchers A single number that presents the number of wins the player addedto the team above what a replacement player (think AAA or AAAA) would add.
We compute the waa W-L% using a Pythagen Pat conversion and then subtract .500 and multiply by the number of games played." data-filter="1" data-name="Wins Above Average"game-entering Leverage Index Solely for relief appearances, this is the average of each appearances opening leverage indexweighted by the batters faced in that outing.
Team Season This is the win-loss of an otherwise average team for an entire season giving them credit for only the games this player played in. For gamelogs only in seasons we have play-by-play, we include triple plays as well.
For example, for a pitcher this would be waa W-L%in the games the pitcher threw in and a .500 record otherwise."League AL - American League (1901-present)NL - National League (1876-present)AA - American Association (1882-1891)UA - Union Association (1884)PL - Players League (1890)FL - Federal League (1914-1915)NA - National Association (1871-1875)"Double Plays Grounded Into Only includes standard 6-4-3, 4-3, etc. All official seasonal totals do not include GITP's." data-filter="1" data-name="Double Plays Grounded Into"League AL - American League (1901-present)NL - National League (1876-present)AA - American Association (1882-1891)UA - Union Association (1884)PL - Players League (1890)FL - Federal League (1914-1915)NA - National Association (1871-1875)"Runs Batting Number of runs better or worse than average the player was as a hitter. See our about section for a full description of how this is calculated." data-filter="1" data-name="Batting Runs"Runs from Baserunning Number of runs better or worse than average the player was for all baserunning events. Developed by Sean Smith of Baseball Projection.com" data-filter="1" data-name="Baserunning Runs"Runs from Fielding Number of runs better or worse than average the player was for all fielding.
Positive values mean the team defense was above average. We take the teams total balls in play, the balls in play for this pitcher and the teams total runs saved and split the runs among all of the teams pitchers."Runs per 9 IP difference for SP and RPFrom 1960 on we assess factor for starters and relievers.
In that time, relievers have averaged a much lower ERA, and this factor accounts for that difference.
This value includes defensive support and includes additional value for high leverage situations.