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Monthly Report 10

Relative age effect: a serious problem in football


The tenth Monthly Report of the CIES Football Observatory analyses the relative age effect on the possibility of a career in football. The study shows that players born in the first months of the year are over-represented among professional footballers. It also highlights the existence of a selection bias favouring players with precocious physical development. The limiting of this phenomenon would reinforce meritocracy in football.

Monthly Report 9

Youth training in European football: a comparative analysis


Youth training is of fundamental importance for football. Without quality training, the sporting development of the game cannot be guaranteed. The level of spectacle would also be diminished, thus limiting the economic potential of the sport. Issue number 9 of the Monthly Report analyses trends in the percentage of club-trained players in 460 teams of 31 top division European leagues. It also presents clubs who have trained the most footballers participating in these competitions.

Monthly Report 8

Exporting countries in world football


The eighth edition of the CIES Football Observatory Monthly Report analyses the origin of foreign players in 6,135 professional and semi-professional clubs, within 458 leagues located in 183 countries worldwide. In total, 18,660 foreign players from 194 origins were recorded. The study notably shows that Brazil is the most represented among foreign nationals, followed by Argentina and France.

Monthly Report 7

How to build a team for long term success?


Since 2005, the CIES Football Observatory has developed pioneering data analysis to understand the logics of success in football. This Monthly Report unveils the key findings related to the four main dimensions of sustainable squad management: team chemistry, demographic structure, performance analysis and transfer policy.

Monthly Report 6

Transfer values and probabilities


The CIES Football Observatory has built powerful econometric models to estimate both transfer values and transfer probabilities of professional football players. This Monthly Report describes the exclusive approach developed and lists the big-5 league footballers with the highest transfer values and fee-paying transfer probabilities at the end of the 2014/15 season.

Monthly Report 5

Performance analysis: Best clubs and players of the big-5 league season


Since 2010, the CIES Football Observatory has been developing an innovative approach to the technical analysis of performance in football both at team and player levels. This paper details the methodology used, which is exemplified through the presentation of the best clubs and players for the 2014/15 big-5 league season.

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