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#349 Rankings Q. What is the RPI?

The RPI (Rating Percentage Index) is a measure of strength of schedule, and how a team does against that schedule. It does not consider margin of victory. It is used by the WCAA as one of the factors in deciding which teams to invite to the National Tournament and where to seed them.

The basic formula is 25% team winning percentage (WP), 50% opponents' average winning percentage (OWP), and 25% opponents' opponents' average winning percentage (OOWP). When calculating winning percentage (WP), the RPI weights a road win as 1.4 x a normal win, a home loss as 1.4 x a normal loss, a road loss as 0.6 x a normal loss and a home win as 0.6 x a normal win - neutral site games are not adjusted (weighted at 1.0).

#350 Rankings Q. What is SOS?
  A. SOS stands for strength of schedule. It's calculated as 67% opponents' winning percentage (OWP) and 33% opponents' opponents' winning percentage (OOWP) - the same ratio as in the RPI formula.
#351 Rankings Q. Why isn't the RPI and SOS updated until after game #7?
  A. The RPI and SOS may be significantly skewed early in the season because there are so few games to base them on. The RPI is primarily a measurement of strength of schedule, and how the team did against that schedule. Each season stands on its own. There are no preseason expectations - everyone starts at zero. Consequently, the numbers could be really skewed early in the season because teams have played so few games. For example, a team can be 2-0, but its opponents haven't played anyone else yet, so its strength of schedule is 0. That's 75% of the formula, so the team won't be rated very highly. After game #7, enough games have been played to start to give a realistic view of RPI and SOS.
#804 Rankings Q. How are the Top 25 rankings determined?

Top 25 rankings are based on a combination of talent and game results. The "talent" portion is calculated by looking at the skill ratings of players (excluding Work Ethic, Stamina, and Durability), with more weight given to a team's top 5 players. The "game results" portion is based on opponent rank, score margin, and result (win or loss) for each completed game.

Before the season starts, all weight is placed on talent - and then as the season progresses, more and more weight is placed on game results. By the end of the season, almost all of the weight is on game results.

There may be significant movement of teams early in the season because there are so few games, but as the season moves along, the best teams will rise to the top.

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