|About the stats|
Over the course of his career, Mariano Rivera pitched 1,283 innings and made 4 plate appearances. Rivera was worth 56.5 Wins Above Replacement (56.3 as a pitcher and 0.0 as a hitter) and 32.3 Wins Above Average (32.5 as a pitcher and 0.0 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 56.5 WAR becomes 67.4 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 32.3 WAA becomes 39.4 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Rivera 138.3 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).
Mariano Rivera has a Hall Rating of 130, making him a member of the Hall of Stats.
Want even more detail about the formula? See the About page.