|About the stats|
Over the course of his career, Roger Clemens pitched 4,916 innings and made 213 plate appearances. Clemens was worth 139.2 Wins Above Replacement (138.7 as a pitcher and 0.6 as a hitter) and 94.7 Wins Above Average (93.9 as a pitcher and 0.6 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 139.2 WAR becomes 141.8 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 94.7 WAA becomes 93.8 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Clemens 310.6 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).
Roger Clemens has a Hall Rating of 291, making him not only a member of the Hall of Stats—but one of the very best players of all time.
Want even more detail about the formula? See the About page.