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- Network structure and centralization tendencies in professional football teams from Spanish La Liga and English Premier LeaguesPublication . Manuel Clemente, Filipe; Josรฉ, Fabio; Oliveira, Nuno; M. L. Martins, Fernando; Mendes, Rui; Figueiredo, Antรณnio Josรฉ; Wong, Del P.; Kalamaras, DimitrisThe aim of this study was to analyse the variance of different competitive leagues, score status, and tactical position in the centrality levels of degree prestige, degree centrality and page rank in football players. A total of 20 matches from the Spanish La Liga League (10 matches) and English Premier League (10 matches) were analysed and codified in this study. In this study only the top four teams and their opponents per each competitive league were analysed. A total of 14,738 passes between teammates were recorded and processed. The multivariate MANOVA revealed statistical differences in centrality among tactical positions (ฮป = 0.958; F(15,1212) = 37.898; p-value = 0.001; ฮท2 = 0.319; Moderate Effect Size). Midfielders had the greatest centrality values, followed by the external and central defenders. The lowest values of centrality were found in goalkeepers and forwards. No statistical differences were found in centrality between different competitive leagues (ฮป = 0.001; F(3,402) = 0.050; p-value = 0.985; ฮท2 = 0.001; Very Small Effect Size) and score status (ฮป = 0.003; F(6,806) = 0.175; p-value = 0.983; ฮท2 = 0.001; Very Small Effect Size).
- General network analysis of national soccer teams in FIFA World Cup 2014Publication . Manuel Clemente, Filipe; M. L. Martins, Fernando; Kalamaras, Dimitris; Wong, P. Del; Mendes, RuiThis study analyzed the network characteristics of successful and unsuccessful national teams that participated in FIFA World Cup 2014. The relationship between the variables of overall team performance and the network characteristics measured on the basis of the passes between teammates was also investigated. A dataset of 37,864 passes between teammates in 64 soccer matches enabled the study on network structure and team performance of 32 national soccer teams. Our results showed significant differences in the dependent variables of network density (F4,123 = 2.72; p = 0.03; ๐ผ๐ ๐ = 0.04; small effect size) and total links (F4,123 = 2.73; p = 0.03; ๐ผ๐ ๐ = 0.04; small effect size) between the teams that reached the later stages of the tournament. Goals scored presented a small positive correlation with total links (r = 0.24; p = 0.001), network density (r = 0.24; p = 0.001), and clustering coefficient (r = 0.17; p ห 0.050). High levels of goals scored were associated with high levels of total links, network density, and clustering coefficient. This study showed that successful teams have a high level of network density, total links, and clustering coefficient. Thus, large values of connectivity between teammates are associated with better overall team performance.