Matrices of binary or count data are modelled under a unified statistical framework using finite mixtures to group the rows and/or columns. These likelihood-based one-mode and two-mode fuzzy clusterings provide maximum likelihood estimation of parameters and the options of using likelihood ratio...

We describe a simple mechanism for achieving two goals: (1) to encourage firms to take environmentally friendly action, and (2) to make environmental protection impervious to political change. We assert that there is wide evidence now that firms adopting an environmental management system (EMS)...