The very next paragraph reads: > In addition to affecting the number of goals scored, the away team received more penalties, implying that referees are making

The very next paragraph reads: > In addition to affecting the number of goals scored, the away team received more penalties, implying that referees are making calls in favor of the home team, possibly as a result of the influence of the crowd. Some individual referees are more susceptible to these influences than others. In fact, more experienced referees are less biased by the impact of a large audience, which suggests that they may develop a resistance to effects of the crowd.