Stats Glossary
How ChicagoBall's numbers work. Advanced stats are measured against each season's league context, so a .500 hitter in a high-scoring year isn't overrated. Record Book
Batting average (H/AB), on-base percentage ((H+BB)/(AB+BB+SAC)), slugging (total bases per at-bat), and OBP + SLG.
Weighted on-base average: like OBP, but a home run counts for more than a walk. Each event gets its run value (walk .69, single .89, double 1.27, triple 1.62, home run 2.10), scaled each season so the league-average wOBA equals league OBP.
Weighted runs created plus: runs a hitter created per plate appearance compared with that season's league average. 100 is average; 150 means 50% better. Adjusts for high- and low-scoring seasons, so you can compare across years.
OPS compared with the league that season: 100 × (OBP/league OBP + SLG/league SLG − 1). 100 is average.
Isolated power: SLG − AVG. Extra bases per at-bat.
Batting average on balls in play: (H − HR) / (AB − K − HR). Very high or low numbers often mean luck.
Walks and strikeouts per plate appearance.
Runs Created (Bill James): (H + BB) × TB / (AB + BB). An estimate of the runs a hitter's line produces.
Wins Above Replacement, batting only: runs a hitter added above a replacement-level hitter (one producing 80% of league-average runs), turned into wins using that season's scoring (more runs per game means more runs per win; games are 7 innings). Softball box scores have no pitching or fielding detail, so this is the batting part of WAR.
Every at-bat recorded from a scorebook knows the outs, runners on, inning and lineup spot, so player pages break hitting down by situation: runners on, two outs, bases loaded, home and away, and more.
The original ChicagoBall formula: 0.8×H + RBI + R + 0.7×2B + 3B + 1.4×HR + AVG × games, over the most recent busy week. League admins can publish a different pick.