|About the stats|
Over the course of his career, Jack O'Brien made 2,380 plate appearances. O'Brien was worth 9.7 Wins Above Replacement and 4.1 Wins Above Average.
After adjusting for length of schedule, catchers, and relief pitchers, the 9.7 WAR becomes 14.1 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 4.1 WAA becomes 5.5 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives O'Brien 24.0 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).
Jack O'Brien has a Hall Rating of 22, leaving him nowhere close to induction to the Hall of Stats.
Want even more detail about the formula? See the About page.