New classes of power series bivariate copulas

摘要

Zhang et al. (2016) introduced a copula based on the geometric distribution. Here, we introduce general classes of copulas containing Zhang et al. (2016)’s copula as a particular case. Physical motivations are given for the general classes. One of the general classes is shown to be more flexible by reanalyzing the two real data sets in Zhang et al. (2016).