Document Type: Research Paper


1 Young Researchers and Elite Club, Maragheh branch, Islamic Azad University, Maragheh, Iran.

2 Department of Mathematics, University of Maragheh, P.O.Box 55181- 83111, Maragheh, Iran.


In 2004, Rodr'{i}guez-Lallena and '{U}beda-Flores have introduced a class of bivariate copulas which generalizes some known families such as the Farlie-Gumbel-Morgenstern distributions. In 2006, Dolati and '{U}beda-Flores presented multivariate generalizations of this class. Then in 2011, Kim et al. generalized Rodr'{i}guez-Lallena and '{U}beda-Flores' study to any given copula family. But there are some inaccuracies in the study by Kim et al. We mean to consider the interval for the parameter proposed by Kim et al. and show that it is inaccurate.


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