No Home Bias in Ghost Games

Because of the COVID-19-pandemic the men’s first German football league (Bundesliga) had to take a break before it was permitted to finish the season 2019/20. However, only ghost games without spectators in the stadiums were allowed in this finishing phase. Comparing these 83 games without spectators with the corresponding 83 regular games between the same teams with spectators before, we find that the normal advantage for the home team disappears. There were 48.2% home wins with spectators and only 32.5% without. This decrease is statistically significant. There were 32.5% away wins before the break and 44.6% thereafter, while the draws increased from 19.3% to 22.9%. However, these increases are not statistically significant. One reason for the lost home advantage is the disappearance of a home bias by the referees, who gave significantly less extra time and also less yellow and red cards to the away team. Keywords: Bundesliga, COVID-19, football, ghost games, home bias

The cauldron has cooled down: a systematic literature review on home advantage in football during the COVID-19 pandemic from a socio-economic and psychological perspective

The phenomenon of home advantage (home bias) is well-analyzed in the scientific literature. But only the COVID-19 pandemic enabled studies on this phenomenon—for the first time in history—on a global scale. Thus, several studies to date examined the effects of empty stadiums by comparing regular matches (with supporters) before the COVID-19 restrictions with so-called ghost games (games without supporters) during the pandemic. To synthesize the existing knowledge and offer an overview regarding the effects of ghost games on home advantage we provide a systematic literature review on this topic. Our findings—based on 26 primary studies—indicate that ghost games have a considerable impact on the phenomenon of home advantage. Deeper analysis further indicates that this effect is based on a reduced “referee bias” and a lack of “emotional support from the ranks”. From a psychological perspective, we argue that our conclusions are highly relevant by emphasizing decision making under pressure and crowd-induced motivation in sports. From a socio-economic perspective, we argue that our findings legitimize a discussion regarding compensation of fans after sporting success as plausible and worth considering. Thus, our results are significant for scientists, sports and team managers, media executives, fan representatives and other persons responsible in the football industry.

The Behaviour of Home Advantage during the COVID-19 Pandemic in European Rink Hockey Leagues

The primary purpose of the present study was to compare the home advantage (HA) and the home team performance in the most relevant European rink hockey leagues (Spanish, Portuguese and Italian), considering the presence or absence of spectators in the competition venues due to the effect of COVID-19 restrictions. The sample was composed of 1665 rink hockey matches (654 from the Spanish league, 497 from the Portuguese league, and 514 from the Italian league) played between the 2018–2019 and 2020–2021 seasons. The HA and match variables comparisons were established using several negative binomial regression models. Results showed that the effect of HA did not disappear despite playing without spectators but decreased from 63.99% to 57.41% (p = 0.002). Moreover, the comparison of the match variables showed that playing with spectators benefited local teams’ performance, especially in the Portuguese and Italian leagues. Playing with spectators favoured local team performance in rink hockey matches, which is more evident in some analysed leagues. However, as HA does not disappear entirely without spectators, it is necessary to study other relevant performance factors that are not directly or indirectly attributable to crowd behaviour in rink hockey performance analyses.

Effect of Playing Venue on Hormonal Responses and Psychological State of Inter-University Volleyball Players

The home advantage is a powerful wonder that happens in the realm of amateur and professional games where most teams win more than 50% of matches. The present study compared the effects of playing venue on hormonal responses and psychological state of inter-university volleyball players at home and away ground. A total of 96 male players age, 18 to 24 years from eight different public and private universities were selected as the subject in this study. Matches were scheduled in such a manner so that each team would play one match on home ground and one on away ground. The results of this study showed that a 13% reduction in the testosterone level of players was seen on the opponent’s home ground before playing the match, whereas, 18% elevation in cortisol level of players was recorded on the opponent’s home ground before-match. Psychological measures indicated that players’ cognitive and somatic anxiety levels were increased on away ground (10% and 13%, respectively) whereas, their self-confidence level declined by 17% on an opponent’s home ground before the commencement of the match. The present study supports the notion that there are differences in pre-competition hormonal and psychological states that may play a key role in ‘the home advantage’ which could affect players’ behavior and match outcomes.

Statistical influence of travelling distance on home advantage over 57 years in the men’s German first soccer division

A statistical analysis is presented that investigates the dependence of team cities’ geographical distances on the effect of home advantage (HA) for 57 years of the men’s German first soccer division (“Bundesliga”), including 17,376 matches (seasons starting from 1964 to 2020). The data shows that the HA can clearly be evidenced in the past and present (statistical p‑value < 0.01) and that it also exists for negligible distances (p < 0.01). The HA and the influence of distance on the HA both significantly decreased gradually over the last decades (p < 0.01). For the first and only time, the HA reversed into an away advantage (AA) for the season 2019/2020 (p < 0.01). The influence of distance on HA has been significant (p < 0.01) in the past (before about 1990) and contributed roughly by about half, compared to a situation without HA or AA. It increases with distance and saturates at around 100 km. Such saturation behaviour is in line with results from higher divisions of other countries with similar travelling distances such as Italy, Turkey and England. However, the distance-dependent contribution to HA has been approximately halved and reduced to an insignificant amount today. Furthermore, the temporal HA reduction is significantly larger for large distances compared to short distances (p < 0.01). Reporting and quantifying a reduction (p < 0.01) of the distance-dependent contribution to HA over a time span of 57 years is novel.

Can Professional Football Players Adapt to Air Pollution? Evidence From China

In this paper, we study the impact of air pollution on Chinese professional football players’ performance. Our primary research question is whether the negative effects of air pollution can be mitigated by adaptation, and which cohort of players can have higher adaptability. We find that a higher pollution level during the game, relative to the adapted pollution level in players’ home cities, has a negative and significant impact on the players’ efforts and accuracy. The impact of non-adapted air pollution can be greatly offset by the home advantage, but not by personal attributes such as the higher ability.

A Machine Learning Approach to Analyze Home Advantage during COVID-19 Pandemic Period with Regards to Margin of Victory and to Different Tournaments in Professional Rugby Union Competitions

Home advantage (HA) is the tendency for sporting teams to perform better at their home ground than away from home, it is also influenced by the crowd support, and its existence has been well established in a wide range of team sports including rugby union. Among all the HA determinants, the positive contribute of the crowd support on the game outcome can be analyzed in the unique pandemic situation of COVID-19. Therefore, the aim of the present study was to analyze the HA of professional high-level rugby club competition from a complex dynamical system perspective before and during the COVID-19 pandemic. HA was analyzed in northern and southern hemisphere rugby tournaments with (2013–2019) and without (2020/21) crowd support by the means of the exhaustive chi-square automatic interaction detection (CHAID) decision trees (DT). HA was mitigated by the crowd absence especially in closed games, although differences between tournaments emerged. Both for northern and southern hemisphere, the effect of playing without the crowd support had a negative impact on the home team advantage. These findings evidenced that in ghost games, where differences in the final score were less than a converted try (7 points), HA has disappeared.

Social influence of spectators

Social influence has been summarised as the change in one’s beliefs, behaviour, or attitudes due to external pressure that may be real or imagined (Cialdini, 2001). In this chapter, we focus on the question of how (sports-relevant) behaviour and athletic performances are influenced by others, especially active and passive (sports) spectators. You have probably already experienced giving a presentation in front of a group of people. Were you influenced by the presence of your audience? Was your performance better, worse, or unaffected compared to the rehearsal session, when you practised alone? Is your performance influenced differently when the audience listens attentively as opposed to when they are noisily not paying attention? How does this presence of others impact performances and behaviours in the context of sports? In sports, social influence has already been investigated extensively (cf. Epting, Riggs, Knowles, &amp; Hanky, 2011; cf. Strauss, 2002b). A particular interest within social influence research is the home advantage in team sports (Allen &amp; Jones, 2014; Carron, Loughhead, &amp; Bray, 2005). Research in this field is concerned with understanding whether the performance of the home team is better due to more of their fans being in the stadium.