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How did Russia’s win probability change after Day 1 of Euro 2012?

By Dr. Ed Feng Leave a Comment

Euro 2012 is finally here. It’s time to see how our rankings matches up with the play on the field. For our latest win probabilities for Euro 2012, click here to see our interactive bracket. Here are our three top thoughts from today’s action.

1. Russia shredded the Czech Republic back line.

Sometimes a 4-1 score doesn’t accurately reflect what occurred on the pitch. Maybe a questionable hand ball in the box leads to a penalty kick goal. Maybe it’s a bad offside call.

This time, 4-1 perfectly reflects the poor play of the Czech Republic back line. Russia could have easily scored 6 goals. Even all world goalkeeper Peter Cech couldn’t stop the onslaught, although he did get a hand on two of the goals. In our rankings, the Czech Republic’s defense is 47th best in the world, giving up 1.05 goals against an average offense. They didn’t look nearly that good today.

The Czech Republic’s probability of making the knock out stage dropped from 44% to 24%, while Russia’s chances increased from 63% to 86%. Since Russia has higher chance to make the knock out stage, their chance to win Euro 2012 jumps to 6.9%. This puts them in the same league England, Sweden, Denmark, Portugal, and Italy, countries that all have about a 5-7% of raising the trophy at the end of Euro 2012.

2. Greece and Poland was dramatic.

A red card for Greece on two questionable fouls.

A red card on Polish goalkeeper Wojciech Szczesny that gave Greece a penalty kick.

A save on the first play by the backup Polish goalkeeper Przemwyslaw Tyton on the aforementioned penalty kick.

It all added up to a 1-1 tie for Poland and Greece. Before the tourney, we decided that 10 games of World Cup qualifying was too few games to evaluate Poland. As host country for Euro 2012, they didn’t have to qualify, which doesn’t leave any meaningful games for the squad the last two years. When we added friendly matches since June, 2010 for Poland, their rank shot up from 94 to 44.

But at 44th in our rankings, Poland is the second worst team in this tourney to Croatia. After some good play in the first half, they played like the second worst team in the tourney. Greece was the better side in the 2nd half, and probably the better squad overall.

The tie leaves the probability of making the knock out stage unchanged for Poland and Greece.

3. How about that home field advantage?

In book Scorecasting, Tobias Moskowitz and Jon Wertheim show evidence that home advantage comes from the referee’s preferential treatment for the home team. The first game of Euro 2012 provided a perfect example, as Spanish referee Carlos Velasco Carballo gave Greek defender Sokratis Papastathopoulos two yellow cards in the first half. The first offense was a foul, but not a yellow card offense. On the second play, the Polish attacker simply fell to the ground, aided by Papstathopoulos’s elbow on the way down.

Carballo also gave Poland a red card. But goalkeeper Wojciech Szczesny clearly kicked a Greek player in the ankle to prevent a goal. Chalk up another win for sports analytics.

What did you think?

Please leave us a comment.

Thanks for reading.

Filed Under: Czech Republic National Football Team, Greece National Football Team, Poland National Football Team, Russia National Football Team, Soccer, Soccer Analytics

Check out our interactive bracket for Euro 2012

By Dr. Ed Feng 3 Comments

To play with our interactive bracket, click here.

Who will win Euro 2012?

The talking heads on sports media will certainly share their opinion based on gut instinct. But wouldn’t it be cool to have a card counter’s edge in knowing who will win? An unbiased estimate of the win probability for all 16 teams?

The Power Rank algorithm is used to rank teams and simulate Euro 2012 half a million times.At The Power Rank, we crunch numbers to predict the outcome of tournaments. It begins with our algorithm for ranking teams, which has been more accurate than Vegas at predicting winners of college football bowl games. Then, we use these rankings to simulate Euro 2012 half a million times. Just like the mathematicians who used simulations to beat black jack, we analyze these results to provide a fresh perspective. Perhaps it’s a new view to share with your soccer fanatic friends.

If Poisson random variables means something to you, there’s a description of our methods at the bottom of this post. For everyone else, click here to see all of our predictions. Here, we’ll supplement the bracket with analysis of some important questions.

Who will win Euro 2012?

Spain, the Netherlands and Germany are the three best teams in this tourney. Not many will argue with that. As one can see from hovering over the right most circle in the interactive bracket, these teams have the highest likelihoods of winning the tourney. However, Spain has a much easier route. The Netherlands and Germany occupy the Group of Death with Portugal and Denmark, two other top 12 teams in our world rankings. Spain has a 23.1% chance of winning, a significantly higher likelihood than the Netherlands and Germany at 15.2% and 13.6% respectively.

Still, a 23% win probability is not that large. If each team had an equal likelihood of winning Euro 2012, the win probability would be 6.25%. Spain is 3.7 times more likely to win the tourney. In this year’s NCAA men’s basketball tournament, the University of Kentucky had a 16% chance of winning. This is 10.9 times greater than the 1.5% probability assuming all 68 teams are equal. The European Football Championships are insanely competitive.

Who will survive the Group of Death?

The Netherlands (3), Germany (4), Portugal (7) and Denmark (12) are all in the same group. Just brutal. In comparison, Group A has Russia (20), Czech Republic (24), Greece (42) and Poland (44). This makes it the Group of Eternal Life. While the Netherlands and Germany have about a 60% chance of making it to the knock out stage, Denmark still has a 38% chance.

The strength of this group is even more apparent from the tournament win probabilities. Denmark and Portugal both have about a 5% chance to win Euro 2012, a higher likelihood than any team from the Group of Eternal Life.

How will the host countries Poland and Ukraine do?

These two host countries present a problem for our rankings since they did not have to qualify for Euro 2012. We only use meaningful games such as tournaments and qualifying games to rank teams. This leaves us with only 10 and 12 games to evaluate Poland and Ukraine respectively since 2009. These games were from a failed World Cup qualifying campaign for both countries.

To see whether these countries had performed better lately, we considered friendlies involving Poland and Ukraine since the last World Cup. We added these matches to the set of matches used in our rankings. While the team ranking for the Ukraine barely changed from 31st to 32nd, Poland shot up from 96th to 44th. They’re still essentially the worst team in the tourney, but they’re no longer the 2012 Charlotte Bobcats of the NBA. Poland has clearly performed much better since their failed World Cup qualifying campaign, earning ties against full strength squads from Germany and Mexico.

There are many problems with using friendlies in our rankings. As readers of this site have pointed out, the rules are different (6 substitutions instead of 3), and teams treat these games as exhibitions to try new strategies. However, Poland and Ukraine probably treated these games more seriously since they didn’t have to qualify for Euro 2012. Moreover, the jump in Poland’s ranking is too large to ignore. We decided to use these additional games in our Euro 2012 simulations. With a 0.41 goal advantage as a host country, Poland and Ukraine have a 56% and 53% probability respectively to advance past the group stage.

Note: We have not used the friendlies for Poland and Ukraine in the primary world rankings. Sorry for the confusion, as the rankings on the interactive bracket do not match these rankings.

How did we perform these simulations?

The win probabilities in the interactive bracket are based on The Power Rank algorithm, a method that accounts for strength of schedule and margin of victory in ranking teams. While our team rankings show team strength for 119 countries, we take a different approach to generate win probabilities for Euro 2012. Instead of applying the algorithm to the entire team, we apply it to the offensive and defense separately. This leads to a goal rate for one team’s offense against another’s defense.

From here, we simulate the score of each game in the group round. The score comes from two uncorrelated Poisson random variables based on the goal rates. Moreover, the goals scored and allowed for each team lets us account for tie breakers in each simulation. The Poisson model also applies in the knock out stage. In the unfortunate case a game ends tied after 120 minutes, we pick randomly to determine a winner. Unfortunately, we don’t have the data or analytics to make a better guess about the outcome of a penalty kicks.

What do you think?

Is Poland really that good? Will you completely ignore these predictions because it includes friendlies for Poland and Ukraine? Please leave us a comment.

Thanks for reading.

Filed Under: Germany National Football Team, Netherlands National Football Team, Poland National Football Team, Soccer, Soccer Analytics, Spain National Football Team

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