|About the stats|
Over the course of his career, Walter Johnson pitched 5,914 innings and made 2,534 plate appearances. Johnson was worth 165.1 Wins Above Replacement (152.3 as a pitcher and 12.7 as a hitter) and 108.8 Wins Above Average (96.7 as a pitcher and 12.1 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 165.1 WAR becomes 174.2 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 108.8 WAA becomes 103.0 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Johnson 359.6 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).
Walter Johnson has a Hall Rating of 338, 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.