How does Yahoo (or any system) use stats to create their rankings? I'm trying to come up with an equation to compare players at different position using my on projected stats and I'm having trouble refining the equation.

I have the final stats for all of the team's in my league from last year. I am comparing my projections to last years stats to understand each players impact on that category (Pitcher A will have 15 wins, and it will take 100 wins to lead the category, therefore he contributes ~15%).

Any thoughts will be really helpful.