This one is straightforward. After normalizing the stats, I measure the player's career runs created per 27 outs to the weighted league average runs created per 27 outs for the seasons he played, to develop a relative number.
For each position player in the actual Hall of Fame, I examined their relative quotient and developed a range for the grading system. For instance, catchers get a "C" if the quotient is between 1.06 and 1.16, which means they hit 6-16% better than the league. But a right fielder who gets a 1.06 to 1.16 would score an "F".
The Relative RC/27 score gets normal weight in the GPA.
