|About the stats|
Over the course of his career, Bob Gibson pitched 3,884 innings and made 1,489 plate appearances. Gibson was worth 89.3 Wins Above Replacement (81.7 as a pitcher and 7.5 as a hitter) and 54.0 Wins Above Average (46.8 as a pitcher and 7.3 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 89.3 WAR becomes 90.2 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 54.0 WAA becomes 50.4 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Gibson 180.9 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).
Bob Gibson has a Hall Rating of 170, making him a member of the Hall of Stats.
Want even more detail about the formula? See the About page.