2018 年 7 巻 2 号 p. 233-238
Catching the diffusion of User Generated Contents is difficult. It is because the quality of UGC varies and there is little mass marketing in Consumer Generated Media. These days many researchers model the diffusion with the network effect, where some researchers claim importance of dividing diffusion into trial and repeat. We modeled diffusions of VOCALOID movies in niconico by trial-repeat model, and we find that sometimes network have different effects on trial and repeat.