|About the stats|
Over the course of his career, Tom Seaver pitched 4,783 innings and made 1,552 plate appearances. Seaver was worth 110.1 Wins Above Replacement (106.0 as a pitcher and 3.9 as a hitter) and 68.8 Wins Above Average (65.2 as a pitcher and 3.7 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 110.1 WAR becomes 112.6 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 68.8 WAA becomes 67.3 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Seaver 233.7 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).
Tom Seaver has a Hall Rating of 220, 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.