Maxpreps RPI to be used for Basketball Seeding

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Yappi

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MAXPREPS RPI TO BE USED FOR BASKETBALL SEEDING

The board approved a proposal from OHSAA staff to utilize a ratings percentage index (RPI) by MaxPreps for the purpose of seeding the girls and boys basketball district tournaments. The exact formula is being developed with input from the Ohio High School Basketball Coaches Association. Last season, the OHSAA Northwest District Athletic Board piloted an RPI formula to test the process of having RPI determine seeding instead of a vote by the coaches in the district. Schools will be required to enter scores into MaxPreps.


“The Northwest District piloted using an RPI last year and the process was successful,” said Ute. “The coaches association has wanted to use an RPI for seeding for some time and we are working with them and MaxPreps on the formula now. This will take some work and our schools will need to input scores, but we are pleased to move in this direction for seeding.”
 
 
This is a great move statewide to provide equality during the seeding process. It takes away the “good old boys club” and “conference cluster” voting approaches. Coaches from conferences with strong representation at these meetings will be disappointed - but nobody can say that it doesn’t provide more fairness.

It’s interesting that the OHSAA went with MaxPreps instead of Martin’s RPI, as Martin’s RPI seemingly did a great job with collecting ALL games and updating their RPI spreadsheet in a timely manner. They also included information for top offenses, top defenses, top strength of schedule and top margin of victory.

By going to computer points, this also begins an easier transition to move to larger blended districts across the state - or move to 6 or 7 divisions in the near future.
 
GREENDAY said:
This is a great move statewide to provide equality during the seeding process. It takes away the “good old boys club” and “conference cluster” voting approaches. Coaches from conferences with strong representation at these meetings will be disappointed - but nobody can say that it doesn’t provide more fairness.

It’s interesting that the OHSAA went with MaxPreps instead of Martin’s RPI, as Martin’s RPI seemingly did a great job with collecting ALL games and updating their RPI spreadsheet in a timely manner. They also included information for top offenses, top defenses, top strength of schedule and top margin of victory.

By going to computer points, this also begins an easier transition to move to larger blended districts across the state - or move to 6 or 7 divisions in the near future.
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My school's coach keeps me up to date on these things and he said it's probably inevitable that there will be an increase in the # of divisions. It's just a matter of how many.
 
MaxPreps: The formula is as follows: RPI = (0.40 × WP) + (0.35 × OWP) + (0.25 × OOWP)
For example, a team that finishes 20-2 (.909 Winning Percentage), it's opponents have a .550 OWP and its opponents' opponents winning percentage is .600, the formula is (0.40 x .909) + (0.35 x .550) + (0.25 x .600) = .7061
All opponents count the same; i.e., there is no modifier for playing schools in higher or lower classifications. Games against out-of-state opponents count the same.

Martin RPI: The formula is (WP) + (OWP) + (OOWP) + (SSF).
The Martin formula gives equal weight to winning percentage, opponents' winning percentage and opponents' opponents winning percentage. It does, however, include a modifier for playing schools in higher classifications. He says it accounts for about 5% of the rating.

The MaxPreps formula is pretty similar to Kentucky's, but its weights are 35% for WP and OWP and 30% for OOWP.
Utah also uses an RPI, but its weights are 45%, 45% and 10%. Utah also uses a modified winning percentage which accounts for playing schools in different classifications.
IMO, that would be simple enough to do in Ohio. Just make D1 opponents worth 3 points, D2 2.5, D3 2 and D4 1.5 (or 4-3-2-1, whatever). Then you get the "points" for each win and that total divided by the total number of points available would be the modified winning percentage.
For example, using the 4-3-2-1 format, a team that plays 10 Division I opponents, 8 Division II opponents and 4 Division III opponents would have a total max of 72 points. If the team went 20-2 with both losses to D1 opponents it would have 64 points, its modified winning percentage would be .889.
 
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