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Soccer, Hoops Next to Seed Using MPR
August 6, 2019
By Rob Kaminski
MHSAA benchmarks editor
As the topic of seeding for MHSAA Tournaments continues to swirl in the air of numerous committee meetings on an annual basis, one of the primary concerns continues to focus on the simple question: “How?”
The MHSAA for years has been working behind the scenes on potential formulas which could best be used as a standardized tool to assist in measuring strengths of teams in a given sport.
This spring, the MHSAA introduced the Michigan Power Rating in the sport of Boys Lacrosse. The Representative Council approved limited seeding beginning in 2019-20 for girls and boys soccer and girls and boys basketball, and MPR will be the metric to determine which two teams must be seeded on opposite sides of District brackets in those sports.
“The boys lacrosse tournament has been seeded since it was added as an MHSAA-sponsored sport in 2005. The seeding is done by committee based on several criteria, one of which was statewide power rankings generated by a third-party website. In the Fall of 2018, that website ceased operation – it was the perfect opportunity for the MHSAA to develop its own data-driven, purely objective ratings system and incorporate that data into the seeding criteria,” said Cole Malatinsky, administrative assistant for the sport.
“The benefits of the new MPR system have been already mentioned – it is MHSAA controlled, simple, objective, and transparent, and it can be used by other MHSAA sports in the future.”
MPR is a computer rating formula similar to the popular RPI rating. MPR provides a way to measure a team’s strength relative to other teams, based on games played against other MHSAA tournament teams, largely on the strength of their opponents’ schedules. MPR is purely objective using only the game results listed on MHSAA.com – there is no subjective human element.
What is the basic MPR formula?
MPR is calculated using wins, losses and ties for games played between teams entered into the MHSAA tournament. The final MPR number is 25% of the team's winning percentage, plus 50% of its opponent's winning percentage, plus 25% of its opponent's opponent's winning percentage.
MPR = (.25 x W%) + (.50 x OW%) + (.25 x OOW%)
The MPR formula can be applied easily to other MHSAA team sports.
What game data is included in the formula? What game data is not?
MPR looks only at results between opponents entered into the MHSAA postseason tournament. Wins, losses and ties in multi-team shortened game tournaments (lacrosse, soccer) also count. Forfeits also are counted as wins and losses.
MPR does not use the specific scores of a game or the margin of victory in a game. The location of a game is not included in the MPR formula, and the formula weighs results at the beginning of the season the same as results at the end of the season. Scrimmages are not included.
Why use the MPR formula?
Different rating systems have been used in the past or have been recommended to the MHSAA. We wanted to have a rating system where the data was controlled and stored in house and could be used for any sport featuring head-to-head competitions.
With its own rating system the MHSAA also can control the different components of the formula, thus keeping the tenets of scholastic competition at the forefront (like not including margin of victory in the formula). Finally, by listing all scores and team schedules online, as well as showing the MPR calculator on each team schedule page, the ratings are transparent and can be replicated easily.
CALCULATING MPR
What are the detailed components of the MPR formula?
You need three numbers to calculate your MPR: winning percentage (W%), opponent’s winning percentage (OW%) and opponent’s opponent’s winning percentage (OOW%).
How do you calculate winning percentage (W%)?
Divide the number of wins by the number of total games played. A tie is worth half a win. For MPR purposes, find the winning percentage against all teams that will play in the MHSAA tournament (MPR W%). Games played against out-of-state teams, varsity “B” teams, junior varsity teams, non-school club teams, and any other non-MHSAA tournament participants should not be included when calculating winning percentage. W% should be an easy number to calculate.
How do you calculate opponent’s winning percentage (OW%)?
Average the winning percentages of a team's opponents. When calculating the winning percentage of a specific opponent, use the opponents "Adjusted Winning Percentage" (ADJ W%). Adjusted winning percentage eliminates all games the team played against that opponent (as well as its games against non-MHSAA opponents).
For instance, if the team beat an opponent with an overall record of 4-1, use a record of 4-0 (1.000) for that opponent. If the team lost to an opponent, use a record of 3-1 (.750). Find the ADJ W% for all opponents, and then take the average. If a team plays an opponent team twice, that opponent’s ADJ W% will be counted twice.
OW% is not calculated via the combined record of the opponents; instead take the average of all opponent’s winning percentages.
How do you calculate opponent’s opponent’s winning percentage (OOW%)?
Use the same process described above, except calculated for the opponents of a team's opponents. This number is much harder to manually calculate, so the OW% for every team is listed on the MPR page of the MHSAA website.
Again, simply take the average of all opponent’s OW%.
How often is MPR calculated?
MPR is calculated about every five minutes. Enter a score and a minutes later the team MPR and the MPR of all the team's opponents will update.
How much will my MPR change throughout the season?
You will see wild MPR swings in the beginning of the season, but after about 10 games played your MPR will start to level out. At 20 games played you will see very little movement with each additional game played.
My score is missing. How can it be added?
This is a crowd-sourced system. Any registered user of MHSAA.com can add a missing score. ADs, coaches, parents, students and fans all can login and enter a score for any game.
What are some common errors when calculating MPR?
When calculating your team’s winning percentage, only include games against MHSAA-tournament teams. When calculating your opponent’s winning percentage, don’t include the games they played against you. When calculating ties, count the game as a half-win and half-loss.
What happens if a game is cancelled?
Because the MPR system works off of averages, it will not make a difference in the final MPR if a game cannot be rescheduled. It would not penalize, nor benefit, any team involved in that scenario.
USING THE WEBSITE
Where can I find game scores?
A list of statewide scores for all sports can be found in the MHSAA Score Center. To find a schedule for any team click on “Schools & Schedules” in the top navigation bar, search for the school, then once on the school page click the sport. You can also see a list of all schools (with links to schedules), on the statewide MPR list.
“We continue to have great success in score reporting for varsity boys lacrosse contests. While we state that schedule submission and score reporting to MHSAA.com are required, athletic directors and coaches understand that in order for MPR data to be accurate, we need consistent and accurate score reporting,” said Malatinsky. “MHSAA.com is now the primary site for high school boys lacrosse schedules, results and ratings in the state.”
How should I use the statewide list of teams and MPR?
Linked to the boys soccer page (and eventually to be added for both basketball pages and girls soccer) is a statewide listing of all Michigan Power Ratings (MPR) for teams entered into the MHSAA postseason tournament for that sport. Linked on the MPR page is an explanation of the District draw formula, describing when and how teams will be placed on the bracket.
The MPR data updates every five minutes. Click on the column headings to sort the data. You also can use the drop-down menu to show teams in one Division, or type a District number in the box to filter teams for that District (Region for boys lacrosse).
You also can click on any school name to go to its schedule page.
How do I read the school schedule page?
The schedule at the top of the page shows the date and opponent for all scheduled games, and results for games already played. If results are missing, click “Submit Score” to add a game score.
Below the game schedule is the MPR Calculator. The calculator is split into three sections. The first section shows the three MPR component scores for the team, as well as the team’s current MPR score. The second section shows the MPR information for the team’s opponents – specifically, for the opponents the team already has played (actually, for games where scores have been submitted). Only these games are included in the MPR calculation.
The third section highlights future opponents. The MPR data for future opponents are not used in the MPR calculation for the team.
PHOTO: East Kentwood and Ann Arbor Skyline play for last season’s Division 1 boys soccer championship.
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MHSAA Winter Sports Start with Extended Basketball Schedules, New Wrestling Weights
By
Geoff Kimmerly
MHSAA.com senior editor
December 13, 2022
The addition of two games to basketball regular-season schedules and a new series of wrestling weight classes are likely the most noticeable Winter 2022-23 changes as an estimated 65,000 athletes statewide take part in 13 sports for which the Michigan High School Athletic Association sponsors postseason tournaments.
Girls gymnastics and boys ice hockey teams were able to begin practice Oct. 31, with the rest of those sports beginning in November – including also girls and boys basketball, girls and boys bowling, girls competitive cheer, girls and boys skiing, Upper Peninsula girls and boys and Lower Peninsula boys swimming & diving, and girls and boys wrestling.
A variety of changes are in effect for winter sports this season, including a several that will be noteworthy and noticeable to teams and spectators alike.
Basketball remains the most-participated winter sport for MHSAA member schools with 33,000 athletes taking part last season, and for the first time, basketball teams may play up to 22 regular-season games. This increase from the previous 20-game schedule allows more games for teams at every high school level – varsity, junior varsity and freshman.
Another significant change has been made in wrestling, as the majority of boys wrestling weight classes have been adjusted for this season in anticipation of a national change coming in 2023-24. The updated boys weight classes are 106, 113, 120, 126, 132, 138, 144, 150, 157, 165, 175, 190, 215 and 285 pounds. Only 215 and 285 remain from the previous lineup. There is also one change to girls weight classes, with the 255 class replaced by 235 to also align with national high school standards.
A series of notable changes will affect how competition takes place at the MHSAA Tournament levels. In hockey, in addition to a new classification process that spread cooperative and single-school programs evenly throughout the three playoff divisions, the MHSAA Tournament will employ two changes. The Michigan Power Ratings (MPR) will be used to seed the entire Regional round, not just the top two teams, and prior to the start of Semifinals, a seeding committee will reseed the remaining four teams in each division with the top seed in each then facing the No. 4 seed, and the No. 2 seed facing No. 3.
Bowling also will see an MHSAA Tournament change, as the Team Regional format will mirror the long-standing Team Final with teams playing eight Baker games and two regular games at both levels. And as also applied during the fall girls season, there is a new qualification process for divers seeking to advance to Lower Peninsula Boys Swimming & Diving Finals. In each of the three divisions, each Regional will be guaranteed 10 qualifiers for the Finals, with six more “floating” qualifier entries to be distributed to the Regionals that have one of the previous year’s top six returning Finals divers in their fields. If a team changes division from the previous season, any floating top-six spots are added to the six already allowed in the school’s new division.
A gymnastics rules change provides an opportunity for additional scoring during the floor exercise. A dance passage requirement was added in place of the former dance series requirement to encourage creativity and a more artistic use of dance. The dance passage requires gymnasts to include two Group 1 elements – one a leap with legs in cross or side split position, the other a superior element.
In competitive cheer, the penalty for going over the time limit in each round was adjusted to one penalty point for every second over the time limit, not to exceed 15 points. The new time limit rule is more lenient than the past penalty, which subtracted points based on ranges of time over the limit.
The 2022-23 Winter campaign culminates with postseason tournaments, as the championship schedule begins with the Upper Peninsula Girls & Boys Swimming & Diving Finals on Feb. 18 and wraps up with the Boys Basketball Finals on March 25. Here is a complete list of winter tournament dates:
Boys Basketball
Districts – March 6, 8, 10
Regionals – March 13, 15
Quarterfinals – March 21
Semifinals – March 23-24
Finals – March 25
Girls Basketball
Districts – Feb. 27, March 1, 3
Regionals – March 7, 9
Quarterfinals – March 14
Semifinals – March 16-17
Finals – March 18
Bowling
Regionals – Feb. 24-25
Finals – March 3-4
Competitive Cheer
District – Feb. 17-18
Regionals – Feb. 25
Finals – March 2-3
Gymnastics
Regionals – March 4
Finals – March 10-11
Ice Hockey
Regionals – Feb. 20-March 1
Quarterfinals – March 4
Semifinals – March 9-10
Finals – March 11
Skiing
Regionals – Feb. 13-17
Finals – Feb. 27
Swimming & Diving
Upper Peninsula Girls/Boys Finals – Feb. 18
Lower Peninsula Boys Diving Regionals – March 2
Lower Peninsula Boys Finals – March 10-11
Wrestling – Team
Districts – Feb. 8-9
Regionals – Feb. 15
Finals – Feb. 24-25
Wrestling – Individual
Districts – Feb. 11
Regionals – Feb. 18
Finals – March 3-4
The MHSAA is a private, not-for-profit corporation of voluntary membership by more than 1,500 public and private senior high schools and junior high/middle schools which exists to develop common rules for athletic eligibility and competition. No government funds or tax dollars support the MHSAA, which was the first such association nationally to not accept membership dues or tournament entry fees from schools. Member schools which enforce these rules are permitted to participate in MHSAA tournaments, which attract more than 1.3 million spectators each year.