|About the stats|
Over the course of his career, Joe Kelley made 8,163 plate appearances. Kelley was worth 50.6 Wins Above Replacement and 22.9 Wins Above Average.
After adjusting for length of schedule, catchers, and relief pitchers, the 50.6 WAR becomes 54.9 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 22.9 WAA becomes 27.7 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Kelley 104.8 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).
Joe Kelley has a Hall Rating of 98, making him close to the Hall of Stats borderline—but still on the outside.
Want even more detail about the formula? See the About page.