A: (RA + league RA) ^ 0.28

B: (Leag RA/RA) ^ A

Win%: B/(B+1)

That gives us the Win Percentage of the pitcher. So, we’re saying he is worth a .623 win% in a league where replacement level is .451 for relievers.

We then subtract .451 from .623, multply by total innings, and divide by nine to get WAR. Then factor in leverage.

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