An empirical analysis of the login datum of fitness club membership over the past 27 months is implemented, which shows that the interval time distribution of their logins presents obvious power-law properties whether all members, groups or individuals. And the scaling indexes of groups are different and linked with their level of activity. Studies on a certain time further reveal that the statistical characteristics of the same community can not be affected by the length of time. Moreover, the power exponents of individuals are also diverse. A conclusion is given to show that the scaling inde...
