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Monday, June 25, 2012

Is England poor or unlucky in shoot-outs?

After their 4-2 loss in the quarter finals of this year’s European Championship finals, England holds a record of 6 losses and only 1 win in penalty shoot-outs in the European Championship and the World Cup finals.

World Cup Finals 1990 West Germany England 4-3
European Championship Finals 1996 Spain England 2-4
European Championship Finals 1996 Germany England 6-5
World Cup Finals 1998 Argentina England 4-3
European Championship Finals 2004 Portugal England 6-5
World Cup Finals 2006 England Portugal 1-3
European Championship Finals 2012 England Italy 2-4
(Source http://www.englandfootballonline.com/TeamPenalty/EngPenKickShootoutMtchs.html)

Journalists, players, coaches and managers often describe or compare penalty shoot-outs to draw of lots or a coin toss. If that’s true, each team of the penalty shoot-out has exactly 50% chance of winning, even England.

The probability of 0 or 1 wins out of 7 independent shoot-outs, if the chances are even, can be read from a table of binomial probabilities to P{X <= 1} = 0.0078 + 0.0547 = 0.0625. That is, if England has same chances as its opponent, the chances of winning only one (or zero) out of seven shoot-outs is 6.25%. If we look through the glasses of a 95% confidence interval or acceptance area, we can’t reject that England has just been unlucky, but the low likelihood gives some evidence to believe that England is poorer than their opponents, that is, the assumption of 50% probability of a win for England is probably false.

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