Turnover dos treinadores e desempenho dos clubes de futebol brasileiros

Abstract

The objective of this research is to understand the relationship between the turnover of coaches, financial performance and sports performance of the 22 main Brazilian football clubs between 2008 and 2018. This research uses information collected from different databases to identify the amount of turnover of Brazilian football clubs, the annual ranking of Brazilian clubs released by the Brazilian Football Commission - CBF and the clubs' revenues. The statistical model of multiple regression analysis with panel data was used for this study. Coach turnover is the dependent variable represented by the amount of coach turnover between 2008 and 2018. Financial performance will be the independent variable measured through the total revenues generated annually by the football clubs and transformed into a natural logarithm to align with sporting performance and sporting performance will be the other dependent variable represented by the annual club ranking released by CBF and transformed into a logarithm to adjust the change in criteria that occurred for the ranking score between 2012 and 2013. The Control variables were also used to measure sporting performance (number of goals scored, number of goals conceded, number of matches played, points obtained and titles won), there were also variables related to the profile of the coaches (training of coaches if former professional athlete or not and average age of coaches) and finally the variables related to the profile of football clubs considered as dummies (competitions played and regional location of clubs). The tests performed in three different models, the first model tried to relate financial performance with turnover and control variables, the second model tried to relate sports performance with turnover and control variables and the third model combined sports performance and financial performance with turnover and control variables. Regarding the results, the first model identified a negative relationship between the ranking and the variables (titles won, points obtained and goals against) The second model identified a negative relationship between the revenue and the variables (pro goals, goals against) was also identified a positive relationship with the variables (games played, series played in the National Cup, Brazil Cup, Libertadores of American and South American Cup), the turnover and the other variables tested showed a weak relationship in relation to revenue. And finally, the third model identified a negative relationship between the ranking and revenue and the variables (pro goals, own goals) it was also identified a positive relationship with the variables (games played, series played In National Cup, Brazil Cup, Libertadores of American and South American Cup), the turnover and the other variables tested showed a weak relationship in relation to the ranking. The results of this research indicate that the variables of sporting and financial performance have no significant relationship with the turnover of the soccer coaches, therefore, can be an initial "kick-off" for the development of new studies that aim to analyze these three variables, or to add other financial variables, sports performance and turnover of football clubs in Brazil, which is still scarce at the national level. In addition, the results of work to relate these variables to efficiency can help clubs in their management and decision-making process.