|About the stats|
Over the course of his career, Rube Foster pitched 842 innings and made 305 plate appearances. Foster was worth 12.4 Wins Above Replacement (11.3 as a pitcher and 1.1 as a hitter) and 4.6 Wins Above Average (3.5 as a pitcher and 1.1 as a hitter).
After adjusting for length of schedule, catchers, and relief pitchers, the 12.4 WAR becomes 12.9 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 4.6 WAA becomes 4.1 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Foster 20.3 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).
Rube Foster has a Hall Rating of 19, leaving him nowhere close to induction to the Hall of Stats.
Want even more detail about the formula? See the About page.