|About the stats|
Over the course of his career, Mike Mattimore made 497 plate appearances and pitched 490 innings. Mattimore was worth -3.1 Wins Above Replacement (-0.7 as a hitter and -2.5 as a pitcher) and -6.4 Wins Above Average (-1.3 as a hitter and -5.1 as a pitcher).
After adjusting for length of schedule, catchers, and relief pitchers, the -3.1 WAR becomes -3.1 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 -6.4 WAA becomes 1.1 adjWAA.
Then, the adjWAR and adjWAA are combined, but with extra weighting given to adjWAA. This gives Mattimore -1.1 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).
Mike Mattimore has a Hall Rating of -1, leaving him nowhere close to induction to the Hall of Stats.
Want even more detail about the formula? See the About page.