|About the stats|
Over the course of his career, Lefty Grove pitched 3,939 innings and made 1,577 plate appearances. Grove was worth 103.6 Wins Above Replacement (109.9 as a pitcher and -6.3 as a hitter) and 65.9 Wins Above Average (72.2 as a pitcher and -6.3 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 103.6 WAR becomes 108.1 adjWAR. Then, WAA is adjusted by ignoring negative seasons (thus, truly capturing a player’s peak seasons) and making similar adjustments for catchers and relief pitchers. After these adjustments, the 65.9 WAA becomes 77.8 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Grove 246.8 wWAR. wWAR is then converted to Hall Rating. A Hall Rating of 100 represents the Hall of Stats borderline (similar to OPS+ or wRC+, where 100 represents league average).
Lefty Grove has a Hall Rating of 230, making him not only a member of the Hall of Stats—but one of the very best players of all time.
Want even more detail about the formula? See the About page.