Uncovering offline event similarity of online friends by constructing null models
Cui Wenkuo1, Xiao Jing1, Li Ting1, Xu Xiaoke1, 2, †
       

(a) HPI distribution of null models of exchanging trajectory and (b) HPI distribution of null models of exchanging user events. The x coordinate represents HPI values, and the y coordinate represents the probability of HPI values.