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In baseball statistics, strikeouts per nine innings pitched (abbreviated K/9, SO/9, or SO/9IP) is the mean of strikeouts (or Ks) by a pitcher per nine innings pitched. It is determined by multiplying the number of strikeouts by nine, and dividing by the number of innings pitched.
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 .
Statistics such as wOBA build on this distinction using linear weights. Additionally, the components of OPS are not typically equal (league-average slugging percentages are usually 75–100 points higher than league-average on-base percentages). As a point of reference, the OPS for all of Major League Baseball in 2019 was .758. [10]
In baseball statistics, slugging percentage (SLG) is a measure of the batting productivity of a hitter. It is calculated as total bases divided by at-bats , through the following formula, where AB is the number of at-bats for a given player, and 1B , 2B , 3B , and HR are the number of singles , doubles , triples , and home runs , respectively:
Cook's 1964 book Percentage Baseball was one of the first of its kind. [4] At first, most organized baseball teams and professionals dismissed Cook's work as meaningless. The idea of a science of baseball statistics began to achieve legitimacy in 1977 when Bill James began releasing Baseball Abstracts, his annual compendium of baseball data.
The PA/SO statistic can be calculated by dividing a player's total plate appearances by their total strikeouts. For example, Reggie Jackson accumulated 2,597 strikeouts and 11,418 plate appearances throughout his 21-year baseball career, recording a PA/SO of 4.39. This means that, on average, Jackson struck out once every 4.39 plate appearances.
Hits Per Nine Innings (H/9): This stat represents the average number of hits a pitcher allows per nine innings pitched. It's calculated by dividing hits allowed by innings pitched and multiplying by nine.
A baseball box score includes so much more than just runs, hits, and errors charged to teams. Teams' lineups are shared through box score, as well as an array of other statistics: Hits, at-bats, runs, RBIs (runs batted in), strikeouts, walks, batting average, pitching stats (e.g., innings pitched, earned runs, strikeouts).