|About the stats|
Over the course of his career, Jack Powell pitched 4,389 innings and made 1,764 plate appearances. Powell was worth 55.5 Wins Above Replacement (54.6 as a pitcher and 0.8 as a hitter) and 16.8 Wins Above Average (16.0 as a pitcher and 0.7 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 55.5 WAR becomes 56.3 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 16.8 WAA becomes 22.9 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Powell 97.5 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 Powell has a Hall Rating of 92, making him close to the Hall of Stats borderline—but still on the outside.
Want even more detail about the formula? See the About page.