|About the stats|
Over the course of his career, Christy Mathewson pitched 4,788 innings and made 1,900 plate appearances. Mathewson was worth 106.6 Wins Above Replacement (100.4 as a pitcher and 6.2 as a hitter) and 69.2 Wins Above Average (63.2 as a pitcher and 6.1 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 106.6 WAR becomes 109.2 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 69.2 WAA becomes 71.2 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Mathewson 237.4 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).
Christy Mathewson has a Hall Rating of 222, 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.