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Catcher's ERA
Catcher's ERA (CERA) in baseball statistics is the earned run average of the pitchers pitching when the catcher in question is catching. Its primary purpose is to measure a catcher's game-calling, rather than his effect on the opposing team's running game. Craig Wright first described the concept of CERA in his 1989 book ''The Diamond Appraised''. With it, Wright developed a method of determining a catcher's effect on a team's pitching staff by comparing pitchers' performance when playing with different catchers. Baseball Prospectus writer Keith Woolner has written that "catcher game-calling isn't a statistically significant skill" after doing statistical analysis of catcher performance. Sabermetrician Bill James also performed research into CERA, finding that while it is possible that catchers may have a significant effect on a pitching staff, there is too much yearly variation in CERA for it to be a reliable indicator of ability. James used simulations of catchers with a ...
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Baseball Statistics
Baseball statistics include a variety of metrics used to evaluate player and team performance in the sport of baseball. Because the flow of a baseball game has natural breaks to it, and player activity is characteristically distinguishable individually, the sport lends itself to easy record-keeping and compiling statistics. Baseball "stats" have been recorded since the game's earliest beginnings as a distinct sport in the middle of the nineteenth century, and as such are extensively available through the historical records of leagues such as the National Association of Professional Base Ball Players and the Negro leagues, although the consistency, standards, and calculations are often incomplete or questionable. Since the National League (baseball), National League (NL) was founded in 1876, statistics in the most elite levels of professional baseball have been kept at some level, with efforts to standardize the stats and their compilation improving during the early 20th centur ...
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Earned Run Average
In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Thus, a lower ERA is better. Runs resulting from passed balls, defensive errors (including pitchers' defensive errors), and runners placed on base at the start of extra innings are recorded as unearned runs and omitted from ERA calculations. Origins Henry Chadwick is credited with devising the statistic, which caught on as a measure of pitching effectiveness after relief pitching came into vogue in the 1900s. Prior to 1900 and for many years afterward, pitchers were routinely expected to pitch a complete game, and their win–loss record was considered sufficient in determining their effectiveness. After pitchers like James Otis Crandall and Charley Hall made names for themselves as rel ...
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Pitcher
In baseball, the pitcher is the player who throws ("Pitch (baseball), pitches") the Baseball (ball), baseball from the pitcher's mound toward the catcher to begin each play, with the goal of out (baseball), retiring a batter (baseball), batter, who attempts to either make contact with the pitched ball or draw a base on balls, walk. In the numbering system used to record defensive plays, the pitcher is assigned the number 1. The pitcher is often considered the most important player on the defensive side of the game, and as such is situated at the right end of the defensive spectrum. There are many different types of pitchers, such as the starting pitcher, relief pitcher, middle reliever, left-handed specialist, lefty specialist, setup man, and the closing pitcher, closer. Traditionally, the pitcher also bats. Starting in 1973 with the American League and spreading to further leagues throughout the 1980s and 1990s, the hitting duties of the pitcher have generally been given over t ...
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Catcher
Catcher is a position in baseball and softball. When a batter takes their turn to hit, the catcher crouches behind home plate, in front of the (home) umpire, and receives the ball from the pitcher. In addition to this primary duty, the catcher is also called upon to master many other skills in order to field the position well. The role of the catcher is similar to that of the wicket-keeper in cricket. Positioned behind home plate and facing toward the outfield, the catcher can see the whole field, and is therefore in the best position to direct and lead the other players in a defensive play. The catcher typically calls for pitches using PitchCom, or hand signals. The calls are based on the pitcher's mechanics and strengths, as well as the batter's tendencies and weaknesses. Essentially, the catcher controls what happens during the game when the ball is not "in play". Foul tips, bouncing balls in the dirt, and contact with runners during plays at the plate are all events ...
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Baseball Prospectus
Baseball Prospectus (BP) is an organization that publishes a website, BaseballProspectus.com, devoted to the sabermetric analysis of baseball. BP has a staff of regular columnists and provides advanced statistics as well as player and team performance projections on the site. Since 1996 the BP staff has also published a ''Baseball Prospectus'' annual as well as several other books devoted to baseball analysis and history. Baseball Prospectus has originated several popular new statistical tools that have become hallmarks of baseball analysis. Baseball Prospectus is accredited by the Baseball Writers' Association of America. Four of Baseball Prospectus's current regular writers are members of the Baseball Writers' Association of America and thus eligible to vote for nominees for Major League Baseball's post-season awards and the National Baseball Hall of Fame and Museum, Baseball Hall of Fame. Prospectus Entertainment Ventures, LLC Baseball Prospectus is formally an entity of Pr ...
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Craig R
Craig may refer to: People and fictional characters *Craig (surname), including a list of people and fictional characters *Craig (given name), including a list of people and fictional characters *Clan Craig, a Scottish clan Places United States *Craig, Alaska, a city *Craig, Colorado, a city *Craig, Iowa, a city *Craig, Missouri, a city *Craig, Montana, an unincorporated place *Craig, Nebraska, a village *Craig, Ohio, an unincorporated community *Craig County, Oklahoma *Craig County, Virginia *Craig Township, Switzerland County, Indiana *Craig Township, Burt County, Nebraska *Mount Craig (Colorado) *Mount Craig (North Carolina) *Craig Mountain, Oregon *Craig Field (airport), a public airport near Selma, Alabama, formerly: **Craig Air Force Base, a former United States Air Force base *Craig Hospital, a neurorehabilitation and research hospital in Englewood, Colorado, United States *Fort Craig, a United States Army fort in New Mexico *The Craig School, an independent, private coedu ...
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Keith Woolner
Keith Woolner (born c. 1968) is an author for Baseball Prospectus and is the creator of the statistic Value Over Replacement Player (VORP). VORP is acknowledged by the sabermetrics community as one of the key concepts in the analysis of a player's performance and market valuation. Education and early career Woolner grew up in New Hampshire as a fan of the Boston Red Sox, later moving to Florida as a teenager. He earned two bachelor's degrees from the Massachusetts Institute of Technology: one in Mathematics with Computer Science, and one in Management from the MIT Sloan School of Management. He also earned a master's degree in Decision Analysis from Stanford University. After graduating from MIT, Woolner worked in software development and system management (for Oracle) and several start-ups in Silicon Valley; and later in product management (for SAS). During this time he maintained his avocational interest in baseball statistics and analysis. According to Woolner, ...no matter ho ...
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Sabermetrician
Sabermetrics (originally SABRmetrics) is the original or blanket term for sports analytics in the US, the empirical analysis of baseball, especially the development of advanced metrics based on baseball statistics that measure in-game activity. The term is derived from the movement's progenitors, members of the Society for American Baseball Research (SABR), founded in 1971, and was coined by Bill James, (in 1980, according to SABR.org), who is one of its pioneers and considered its most prominent advocate and public face. The term moneyball refers to the use of metrics to identify "undervalued players" and sign them to what ideally will become "below market value" contracts; it began as an effort by small-market teams to compete with the much greater resources of big-market ones. Early history English-American sportswriter Henry Chadwick developed the box score in New York City in 1858. This was the first way statisticians were able to describe the sport of baseball by num ...
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Bill James
George William James (born October 5, 1949) is an American baseball writer, historian, and statistician whose work has been widely influential. Since 1977, James has written more than two dozen books about baseball history and statistics. His approach, which he named sabermetrics after the Society for American Baseball Research (SABR), scientifically analyzes and studies baseball, often through the use of statistical data, in an attempt to determine why teams win and lose. In 2006, ''Time (magazine), Time'' named him in the Time 100, ''Time'' 100 as one of the most influential people in the world. In 2003, James was hired as senior advisor on Baseball Operations for the Boston Red Sox and worked for the team for 17 years during which they won four World Series championships. Early life James was born in Holton, Kansas. He joined the United States Army in 1971. After his service, he graduated from the University of Kansas in 1973 with degrees in English and economics, and in 197 ...
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Earned Run
In baseball, an earned run is any run that was fully enabled by the offensive team's production in the face of competent play from the defensive team. Conversely, an unearned run is a run that would not have been scored without the aid of an error or a passed ball committed by the defense; it is "unearned" in that it was, in a sense, "given away" by the defensive team. Earned and unearned runs count equally toward the game score; the difference is purely statistical. Both total runs and earned runs are tabulated as part of a pitcher's statistics, but earned runs are specially denoted because of their use in calculating a pitcher's earned run average (ERA), the number of earned runs allowed by the pitcher per nine innings pitched (i.e., averaged over a regulation game). Thus, in effect, the pitcher is held personally accountable for earned runs, while the responsibility for unearned runs is shared with the rest of the team. To determine whether a run is earned, the official sco ...
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Earned Run Average
In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Thus, a lower ERA is better. Runs resulting from passed balls, defensive errors (including pitchers' defensive errors), and runners placed on base at the start of extra innings are recorded as unearned runs and omitted from ERA calculations. Origins Henry Chadwick is credited with devising the statistic, which caught on as a measure of pitching effectiveness after relief pitching came into vogue in the 1900s. Prior to 1900 and for many years afterward, pitchers were routinely expected to pitch a complete game, and their win–loss record was considered sufficient in determining their effectiveness. After pitchers like James Otis Crandall and Charley Hall made names for themselves as rel ...
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