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.
West Bloomfield Makes Good on Preseason Goal with 1st Finals Win
By
Paul Costanzo
Special for MHSAA.com
March 19, 2022
EAST LANSING – Apparently Sydney Hendrix holds a grudge.
The West Bloomfield junior has held onto the hurt from her team’s Regional Semifinal loss to Hartland in 2020, and on Saturday, she let it all out on the court.
Hendrix had 12 points and 13 rebounds to lead the Lakers to a 51-42 victory over the Eagles in the Division 1 Girls Basketball Final at the Breslin Center.
“We lost to Hartland my freshman year, and I think I was crying for like three days straight,” Hendrix said. “I wanted it so bad, but we couldn’t pull out the win. I’ve been wanting my get-back for a minute now. I’m just so glad we got it.”
The title win was the first in program history for the Lakers, who last played in a Final in 1989. This year’s team set the goal of winning it all at the first practice, and after losing its opening game against Dexter, won 25 straight to accomplish that.
“I remember November 12, everybody coming together and saying they wanted the state championship,” West Bloomfield coach Darrin McAllister said. “So I knew at that time, our coaching staff, we had to do everything in our power to get us to this point. We bought into the ‘I believe’ mindset. We worked our tails off, and we got here to the Breslin and we did what we had to do.”
West Bloomfield never trailed in the game, and held Hartland at arm’s length throughout most of it.
Indya Davis led the Lakers (25-1) with 17 points and 11 rebounds, while Summer Davis and Myonna Hooper each scored nine points for the Lakers.
“This game was very personal,” said Hooper, who was also on that 2020 team. “We took it upon ourselves to make sure everybody was in the position they needed to be, everybody was playing their role, everybody was executing, everybody was picking each other’s heads up when somebody was down. From Day 1, we’ve been talking about this, and we never let up.”
Amanda Roach scored 21 points for Hartland to lead all scorers. Emerson Sargeant had six points and nine rebounds for the Eagles (25-2).
Roach had half of Hartland’s field-goal makes in the game, as the Eagles struggled to make shots, finishing 16 of 64 from the field.
“I think West Bloomfield had a lot to do with that, but on the other hand, we did have some good looks,” Hartland coach Don Palmer said. “Shots that we normally make, they didn’t go today. Sometimes, that just kind of feeds.”
West Bloomfield led by as many as 14 points in the second half. Roach tried to pull the Eagles back into the game, and nearly did in the fourth quarter. She hit a long 3-pointer to bring her team to within seven with four minutes to play and put some belief in the Hartland fans.
The Eagles wouldn’t get any closer, though, until she hit another long 3 with 25 seconds to play that brought her team within six of the lead. But West Bloomfield was able to close the game out at the free throw line.
“I personally thought we still had a chance with 30 seconds left,” Roach said. “We fight back every single game. I’m just proud of everybody.”
Each Hartland push was met with a response from the Lakers, and often it was the result of an offensive rebound, or two. Hendrix had seven on her own.
“She’s a beast,” Palmer said. “She is strong, she can finish, she’s got a little bit of a mid-range jumpshot. A lot of times when you have teams with ‘superstars’ those other kids get lost in the coverage, but I certainly picked (Hendrix) up on tape.”
Hartland also came into Saturday in search of its first Finals title after advancing beyond the Quarterfinal for the first time.
“Obviously, it feels great to be up here and play with all these girls that I started with,” Hartland senior Leah Lappin said. “Obviously, disappointing because we didn’t play our best. But it was good to play with these girls.”
PHOTOS (Top) West Bloomfield’s Indya Davis (24) turns toward the lane Saturday as Hartland’s Lauren Sollon (25) walls off the baseline. (Middle) The Lakers’ Myonna Hooper (4) prepares to make her move toward the hoop. (Below) Sydney Hendrix (5) pulls up for a shot over Sollon’s reach. (Click for more from Hockey Weekly Action Photos.)