Affiliation: | 1. Department of Statistics, College of Science, Engineering and Technology, University of South Africa, Pretoria, South Africa;2. sandile@tuks.co.za;4. LUNAM Université, Université de Nantes &5. IRCCyN UMR CNRS 6597, Nantes, France;6. Tiplo Pty Ltd, Midrand, South Africa |