|About the stats|
Over the course of his career, Andy Pettitte pitched 3,316 innings and made 237 plate appearances. Pettitte was worth 60.4 Wins Above Replacement (60.7 as a pitcher and -0.5 as a hitter) and 29.4 Wins Above Average (29.8 as a pitcher and -0.5 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 60.4 WAR becomes 60.9 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 29.4 WAA becomes 30.0 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Pettitte 114.9 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).
Andy Pettitte has a Hall Rating of 108, making him a member of the Hall of Stats—but one who sits very close to the borderline.
Want even more detail about the formula? See the About page.