1. School of Mathematics, Statistics and Computer Science, College of Agriculture Engineering and Science, University of KwaZulu-Natal, Durban, South Africa
2. Department of Statistics, Bahir Dar University, Bahir Dar, Ethiopia
3. Crop Nutrition and Soils, Plant and Environment Resource Centre, South Africa Sugarcane Research Institute, Mount Edgecombe, South Africa
4. School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Scottsville, South Africa