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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.
![Zavier Thomas (7) leads a run toward the goal for Gull Lake on Saturday.](/sites/default/files/2022-11/221105_D2_2H.jpg)
Gull Lake Makes 1st-Minute Goal Stand in Claiming 4th Finals Title
By
Perry A. Farrell
Special for MHSAA.com
November 5, 2022
NOVI – Thirty seconds changed the Division 2 boys soccer championship match between Richland Gull Lake and Bloomfield Hills Cranbrook Kingswood on Saturday at Novi High School.
It took Gull Lake 30 seconds to score, as junior Ryker Corstange took a slick pass from senior Jasek Zielaskowski and blasted a shot from the left side to give the Blue Devils a 1-0 lead.
That ended up the only goal of the game, as Gull Lake (22-3) claimed its fourth MHSAA Finals title in a defensive struggle.
“Did I think that would stand up? With our defense, I would say yes,’’ said Blue Devils goalkeeper Evan Kaiser, who was brilliant in the victory. “We have a great defense. Everyone does their job. Everyone works hard, and we come together as one big family. Getting a goal early doesn’t take the pressure off, but it definitely helps our defense knowing we are up a goal.”
Gull Lake didn’t allow a goal during its six-game MHSAA Tournament run.
“We got a wake-up call when we lost to Mattawan 4-3 during the regular season,’’ said Ryker Corstange, the nephew of head coach Jeff Corstange. “That sparked us. We were insanely mad. We wanted to go out and show people what Gull Lake was about. We’ve been known to score pretty fast. Jasek just worked his tail off, got to the corner, crossed it and I was just there to shoot it in.’’
It was Jeff’s fourth Finals title, as he previously won three with the girls soccer team at Gull Lake.
“This one meant the most,’’ said Ryker.
Jeff was noncommittal.
“We got healthy and got back to what we were supposed to be,’’ said Jeff Corstange. “We got Tre (Reiner) back there. He was out for six weeks, and he’s one of our best defenders. Getting him back in the postseason was huge for us. I didn’t think that goal would hold up, especially with the wind the way it was. The way they pressed and the way they shoot, with No. 2 (Nathan Hooker). We thought he might be able to take advantage of the wind. With that wind, you have to hit it a little softer. We’re not used to that.
“It was a beautiful pass from Jasek, sliding the ball over. We’ve been doing that all postseason. We practice it all the time, and they made the play. It was a beautiful goal.’’
Gull Lake entered the postseason as the top-ranked squad in Division 2, with its last title in 2020. The Blue Devils claimed victories over No. 2 Grand Rapids Forest Hills Northern, No. 8 Parma Western and No. 9 DeWitt during their march to the championship game.
Cranbrook (15-2-3) won the Detroit Catholic League AA title and was ranked No. 3 at the end of the regular season. The Cranes pitched four shutouts on their run to the championship under veteran coach Chad O’Kulich.
Playing with the lead, Gull Lake kept the pressure on the Cranes, keeping play in Cranbrook’s end. Gull Lake’s Zavier Thomas was a constant threat.
Cranbrook found itself a goal down with no offense and no shots on goal in the first half.
“Kaiser is an incredible athlete. He’s a great keeper and one of the best I’ve coached,’’ said Jeff Corstange.
Desperate for a second goal, Adam Boyle hit the crossbar for Gull Lake 11 minutes into the second half.
Cranbrook finally got a shot on goal with 20:58 to play, but the attempt went wide.
The Cranes’ best chance to score came from Evan Evans, a senior midfielder. But his shot also hit the crossbar.
“They played hard, and they played aggressive, but they are classy,’’ said O’Kulich. “There was great sportsmanship out there. I think that starts at the high school level.’’
PHOTOS (Top) Zavier Thomas (7) leads a run toward the goal for Gull Lake on Saturday. (Middle) Nathan Hooker (2) advances the ball for Cranbrook Kingswood.