Refereeing in the UEFA competitions seem to reflect the European league norms. The refereeing in MLS seems to be close to the European norms in terms of fouls called, yellow cards and red cards. It is a bit closer to EPL norm, which is not surprising. Unlike some commentators who want to think that in MLS too few cards are shown, the averages show that PRO officials are doing a job which is close to global norms. You can use this data in any way you want to reach conclusions and interpretations, but these or similar data is all you will find to analyze referee performances across leagues and years. Unfortunately, there are no uncontested statistics about correct and incorrect calls. Most of the foul calls in a game fall into the category of gray decisions. Soccer refereeing is a very difficult task; one should realize that there is no such thing as perfection in refereeing, although excellence can be sought.
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