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As with many sports, and perhaps even moreso, statistics are very important to baseball. A seemingly intrinsic part of the game is the keeping of statistics on the achievements of the players.
The practice was started by Henry Chadwick in the 19th century who devised the concepts of batting average and earned run average based on his experience of cricket. Statistics have been kept for the Major Leagues since their creation.
General managers and baseball scouts study player statistics to decide what players to try to get for their team. Managers, catchers and pitchers study statistics of batters on opposing teams to figure out how best to pitch to them and position the players. Managers and batters study opposing pitchers to figure out how best to hit them. Managers often base their personnel decisions during the game on statistics, such as choosing who to put in the lineup, or which relief pitcher to bring in.
Traditionally, statistics like batting average for batters—the number of hits divided by the number of at bats—and earned run average—approximately the number of runs given up by a pitcher per nine innings—have governed the statistical world of baseball. However, the advent of sabermetrics brought an onslaught of new statistics that better gauge a player's performance and contributions to his team from year to year.
Some sabermetrics have entered the mainstream baseball statistic world. On-base plus slugging is a somewhat complicated formula that gauges a hitter's performance better than batting average. It combines the hitter's on base percentage—hits plus walks plus times hit by pitches divided by plate appearances—with their slugging percentage—total bases divided by at bats. Walks plus hits per inning pitched (or WHIP) gives a good representation of a pitcher's abilities; it is calculated exactly as its name suggests.
Also important are all of those statistics in certain in-game situations. For example, a certain hitter's ability to hit left-handed pitchers might cause his manager to give him more chances to face lefties. Other hitters may have a history of success against a given pitcher (or vice versa), and the manager may use this information to engineer a favourable matchup.
Commonly used statistics
Most of these terms also apply to softball. Commonly used statistics with their abbreviations are explained here:
Hitting statistics
Pitching statistics
See also
Fielding statistics
See also
Other terminology
References
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