|About the stats|
Over the course of his career, John Kelly made 479 plate appearances. Kelly was worth -3.0 Wins Above Replacement and -3.9 Wins Above Average.
After adjusting for length of schedule, catchers, and relief pitchers, the -3.0 WAR becomes -5.0 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 -3.9 WAA becomes 0.0 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Kelly -5.0 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).
John Kelly has a Hall Rating of -5, leaving him nowhere close to induction to the Hall of Stats.
Want even more detail about the formula? See the About page.