Figure 4

Study of the Ledge event. (a) Time evolution of the fraction of commands sent each minute. Note that a single player should be able to finish this area in a few minutes, but the crowd needed 15 hours. The time series has been smoothed using moving averages. (b) Hierarchical clustering of the time series of each group of users (see main text for details). (c) Left: Mean time needed to exit the area according to our simulations as a function of the fraction of griefers in the system and the noise in it. Right: 1% quantile of the time needed to exit the area, note that the y axis is given in minutes instead of hours