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Encyclopedia > Similarity score

In Sabermetrics and APBRmetrics, Similarity Scores are a method of comparing baseball and basketball players (usually in MLB or the NBA) to other players, with the intent of discovering who the single most similar historical player is to a certain player. Sabermetrics is the analysis of baseball through objective evidence, especially baseball statistics. ... Baseball is a team sport in which a player on one team (the pitcher) attempts to throw a hard, fist-sized ball past a player on the other team (the batter), who attempts to hit the baseball with a tapered, smooth cylinder called a bat. ... Sara Giauro shoots a three-point shot, FIBA Europe Cup for Women Finals 2005 Michael Jordan of the Chicago Bulls attempts to score. ... Major League Baseball (MLB) is the highest level of play in professional baseball in the world. ... The National Basketball Association, more commonly referred to as the NBA, is the worlds premier mens professional basketball league and one of the major professional sports leagues of North America. ...


Like many original sabermetric concepts, similarity scores were first introduced by Bill James, in his 1994 book The Politics of Glory. James initially created the concept as a way to effectively compare non-Hall of Fame players to players in the Hall, to see who was either on track to make the HOF, or to determine if any eligible players had been snubbed by the selection committee. For example, if the most similar players to a non-HOFer were all in the Hall of Fame, one could effectively argue that that player should be in the Hall. Bill James (born October 5, 1949 in Mayetta, Kansas) is an important and influential baseball writer / statistician. ... 1994 (MCMXCIV) was a common year starting on Saturday of the Gregorian calendar, and was designated the International year of the Family. ... Various fields of endeavour have established Halls of Fame that honour individuals of noteworthy achievement in their respective fields. ...


More recently, similarity scores have been used to determine career paths and projected statistics for players. The logic behind this line of thought is simple: players often follow similar career trajectories to their most similar players, so the historical similar players' performance in years after the active player's current age should be a good predictor of that active player's future production. An example of this would be the Football Outsiders' discovery that all but the highest caliber of wide receivers suffer a marked decline after their seventh season in the NFL, a fact that bore out for the recievers selected in the 1996 NFL Draft when their production collectively slipped. [1] Jerry Rice holds many career records for wide receivers in the National Football League. ... The National Football League (NFL) is the largest professional American football league, consisting of thirty-two teams from American cities and regions. ... The 1996 NFL Draft Categories: | ...


Many baseball analysts have augmented James' method over the years, or come up with their own system of measuring similarity. John Hollinger developed a similar system for basketball players in his Pro Basketball Forecast series of books, and several APBRmetricians have expanded on his methodology. Similarity scores are also used extensively in many statistical forecasting programs. Baseball Prospectus employs a projection system known as PECOTA which heavily relies on similarities and past performance, while Pro Football Prospectus (written by the Football Outsiders) has their own system (dubbed "KUBIAK" after longtime Broncos backup quarterback Gary Kubiak) for projecting future performance. Hollinger uses his similarity-score method in his statistical-projection system as well. John Hollinger is an influential figure in the field of quantitative analysis in basketball. ... Baseball Prospectus, sometimes abbreviated as BP, is a think-tank focusing on the statistical analysis of the sport of baseball, which is also known as sabermetrics. ... City Denver, Colorado Other nicknames {{{nicknames}}} Team colors Broncos Navy Blue, Orange, and White Head Coach Mike Shanahan Owner Pat Bowlen Fight song {{{song}}} Mascot Miles Local radio Flagship stations: KOA (850 AM)-English and KBNO (1280 AM)-Spanish Announcers: David Diaz-Infante and Dave Logan-English; Luke Sandoval and... The quarterback is a position in the offensive backfield of American and Canadian football, directly behind players of the line. He is generally the leader of the offensive team when it is on the field, responsible for initiating play by receiving the snap of the ball from the center. ... Gary Kubiak is the offensive coordinator of the Denver Broncos, under current head coach Mike Shanahan. ...


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