Bisons baseball | Sabermetrics

Sabermetrics refers to the field of baseball statistical study and the development of new statistics and analytical tools. The term is also used to refer directly to new statistics themselves. The term was coined around 1980 by one of the field's leading proponents, Bill James, and derives from the Society for American Baseball Research (SABR).[131]

The growing popularity of sabermetrics since the early 1980s has brought more attention to two batting statistics that sabermetricians argue are much better gauges of a batter's skill than batting average:[132]

On-base percentage measures a batter's ability to get on base. It is calculated by taking the sum of the hitter's successes in getting on base (hits plus walks plus hit by pitches) and dividing that by the batter's total plate appearances (at bats plus walks plus hit by pitches plus sacrifice flies), except for sacrifice bunts.[133]
Slugging percentage measures a batter's "power" (more accurately, hitting ability, strength, and speed). It is calculated by taking the batter's total bases (one per each single, two per double, three per triple, and four per home run) and dividing that by the batter's at bats.[134]
Some of the new statistics devised by sabermetricians have gained wide use:

On-base plus slugging (OPS) measures a batter's overall ability. It is calculated by adding the batter's on-base percentage and slugging percentage.[135]
Walks plus hits per inning pitched (WHIP) measures a pitcher's ability at preventing hitters from reaching base. It is calculated exactly as its name suggests.[136]

source : wikipedia