An explanation of the Oregon School Activities Association’s ranking system (info found on OSAA.org):
OSAA’s ranking system is algorithmic, not human-created, and are used to help create contest match-ups for the first round of championship brackets once the playoff qualifying teams are known, or to select teams for championship brackets in certain sports.
OSAA rankings are derived from a combination of two ratings: the RPI Rating and the Colley Rating.
A team’s RPI is calculated using a formula that includes two weighted variables. The first is the team’s Weighted Winning Percentage which carries 35 percent and the second is the team’s Opponents’ Winning Percentage, which is weighted at 65 percent. Colley Ratings come from the Colley Bias Free Rating Method and are based on a complex formula that calculates winning percentages, which are adjusted to account for a team’s strength of schedule.
Rankings start from scratch each year and do not take into account how teams finish the year prior. Ratings also do not take into account margins of victory or defeat; only wins, losses and ties.
n Why some teams are ranked lower than other teams they may have defeated (i.e. Summit No. 1, HRV No. 2):
The OSAA ranking system is a combination of measurements of a team’s strength of schedule, how well a team does against that schedule, and the impacts of the team’s opponents in addition to the team’s overall performance in a season. To look at only one contest ignores the “any given day” aspect of sports. Only looking at a team’s individual performance against a single opponent is too simplistic and narrowly focused to provide a fair, unbiased rating which compares every team to every other team.
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