Batting Park Factor, also simply called Park Factor or BPF, is a baseball statistic that indicates the difference between runs scored in a team's home and road games. Most commonly used as a metric in the sabermetric community, it has found more general usage in recent years. It is helpful in assessing how much a specific ballpark contributes to the offensive production of a team or player.
The formula most commonly used is:
In this formula, all runs scored by or against a team at home (per game) are divided by all runs scored on the road (per game). Parks with a Park Factor over 100 are those where more overall runs are scored when the team is at home than are scored when the team is away. While some variation can be attributable to fluctuations in offensive and defensive performance, PF accounts for the production of both teams in each park and, correspondingly, is very useful in trying to determine which ballparks are "hitter friendly" and which are "pitcher friendly". One criticism is that Park Factor does not account for differences in pitching between teams. An above-average pitching staff may distort their home stadium's Park Factor by making it seem more pitcher-friendly than it really is.
Minute Maid Park, previously known as The Ballpark at Union Station, Enron Field, and Astros Field, is a ballpark in Downtown Houston, Texas, United States, that opened in 2000 to house the Houston Astros of Major League Baseball (MLB). The ballpark is Houston's first retractable-roofed stadium, and features a natural grass playing field. The ballpark was built as a replacement of the Astrodome, the first domed sports stadium ever built, which opened in 1965. It is named for beverage brand Minute Maid, a subsidiary of The Coca-Cola Company, which acquired naming rights in 2002 for $100 million over 30 years. As of 2016, Minute Maid Park has a seating capacity of 41,168, which includes 5,197 club seats and 63 luxury suites.Nationals Park
Nationals Park is a baseball park along the Anacostia River in the Navy Yard neighborhood of Washington, D.C. It is the home ballpark for the Washington Nationals, the city's Major League Baseball franchise. When the Montreal Expos franchise relocated to Washington, D.C. and became the Nationals, they temporarily played at RFK Stadium until Nationals Park was completed. It is the first LEED-certified green major professional sports stadium in the United States.
The ballpark, designed by HOK Sport and Devrouax & Purnell Architects and Planners, cost $693 million to build, with an additional $84.2 million spent on transportation, art, and infrastructure upgrades to support the stadium for a total cost of $783.9 million. The stadium has a capacity of 41,339. The Washington Monument and the Capitol building are visible from the upper decks on the first base side of the field.
The park's name echoes that of the early-1900s ballpark used by the Washington Senators, National Park, until it was rebuilt and renamed Griffith Stadium.
Nationals Park hosted the 2018 Major League Baseball All-Star Game, the first All-Star Game to be played in Washington, D.C. since 1969.Peripheral ERA
Peripheral ERA (PERA) is a pitching statistic created by the Baseball Prospectus team. It is the expected earned run average taking into account park-adjusted hits, walks, strikeouts, and home runs allowed. Unlike Voros McCracken's DIPS, hits allowed are included. PERA doesn't attempt to eliminate the effect of luck on batted balls away from ERA, instead attempting to account for good (or bad) luck in the combinations of hits, walks, home runs, and strikeouts. A lower PERA than EqERA (adjusted ERA) may indicate poor luck which may even itself out in the future, leading to a lower EqERA despite no change in quality of pitching.Run batted in
A run batted in (RBI), plural runs batted in (RBI or RBIs), is a statistic in baseball and softball that credits a batter for making a play that allows a run to be scored (except in certain situations such as when an error is made on the play). For example, if the batter bats a base hit, then another player on a higher base can head home to score a run, and the batter gets credited with batting in that run.
Before the 1920 Major League Baseball season, runs batted in were not an official baseball statistic. Nevertheless, the RBI statistic was tabulated—unofficially—from 1907 through 1919 by baseball writer Ernie Lanigan, according to the Society for American Baseball Research.Common nicknames for an RBI include "ribby" (or "ribbie"), "rib", and "ribeye". The plural of RBI is generally "RBIs", although some commentators use "RBI" as both singular and plural, as it can also stand for "runs batted in".