I've been playing around with determining the "optimal" RPI-like soccer rankings formula to augment the coaches poll to rank high schools since those polls only rank top teams. Any other stat geeks out there with ideas or links to research on: 1. Best home field adjustments 2. Best way to include draws in winning percentage(1/2 win seems to be standard) 3. Best weighting for strength-of-schedule measures 4. Best weighting of recent scores to all scores I'm against using goals in my calculations for "ethical" reasons, but if you have done some work showing, I'll be openminded. Currently, I am getting best results with 1. No home field adjustment 2. Draws = 1/3 win 3. .3 win pct .4 opp win pct .3 opp opp win pct, but opp and opp opp win pct have lower bound of .333 to prevent poor opponent from ruining your ranking. 4. .67 to last 50% of matches, .33 to first 50% of matches My criteria for "best" weighting is cumulative winning percentage of higher ranked over lower ranked (based on rankings on the day the match was played).