Formulas

Batting Average: Hits / At Bats
Slugging Percentage: Total Bases / At Bats
On Base Percentage: (Hits + Walks) / (At Bats + Walks)
Production: Slugging Pct + On Base Pct
Home Run Percentage: Home Runs / 100 At Bats
RBI Percentage: RBI / 100 At Bats
Isolated Power: Slugging Pct - Batting Avg
Run Percentage: Runs / 100 At Bats
Double Percentage: Doubles / 100 At Bats
Triple Percentage: Triples / 100 At Bats
Runs Produced: Runs + RBI - Home Runs

Power Rating: (2 * HR + RBI + R + H + SB) * .9 / 162 Games
(Multiply Power Rating by .8 for 19th Century Players)

Total Player Rating: Power Rating * Batting Average
   OR   Power Rating * (.7 * Batting Avg + .015 * HR PCT)

Efficiency: (TB + BB + SB + R + RBI + HR) / (1.5 * (AB + BB))

Total Baseball Ranking (Batters): Total Player Rating + .367 * Power Rating

Ultimate Batter Ranking: Total Baseball Ranking * Efficiency