High School & College Basketball Ratings & Rankings This winter iHoops will be the new home of Active Power Ratings. Over the next few weeks we will launch first college and then high school ratings and rankings, so be sure to check back soon. Active Power Ratings (APR) provide a way to compare your team with others, even though your team may not play them. APRs are calculated throughout the week, so come back often to see how your ratings have changed. Select a region and then one of the SportsPower classifications to see regional and national ratings. If the state is ‘greyed out’ it means we haven’t collected enough scores yet to produce meaningful ratings. Help us get the scores by submitting them on your team page. Active Power Ratings are calculated using a proprietary formula by the Power Ratings Engine (PRE). Using a comprehensive database of schedules and scores, ratings are produced and then used to rank different groups of teams. All teams start even at the beginning of the season and past season performance has no influence on the ratings. The program is unbiased because it has no knowledge of favorites or underdogs. A minimum of five or six game results per team are required in order for the PRE to evaluate the strength of the teams. For example, based on past game scores, if two teams played each other on a neutral field the margin of victory or loss will, on average, be equal to the difference in power rating between these two teams. Power ratings are based on 'trends' in the data where past performance is used to predict future performance. Power ratings are meant to serve as a baseline for ranking teams when only game results are the criteria. Due to limited data, early season ratings are less meaningful than end of season ratings. The more data you have to analyze the more accurate are the results. It can take more than 10,000 iterations before determining the final ratings. Once the ratings are calculated, derived quantities are computed based on the power ratings. As an example, strength of schedule is computed based on the average Power Ratings of opponents. Other derived quantities including Rating Percentage Index (RPI), Quality Wins, etc. are also computed based on Active Power Ratings.