1. Department of Statistics, Universitas Padjadjaran, Sumedang 45363, Indonesia
2. Department of Mathematics, Universitas Padjadjaran, Sumedang 45363, Indonesia
3. Doctoral Program of Mathematics, Universitas Padjadjaran, Sumedang 45363, Indonesia
4. Program Study of Statistics, Matana University, Banten 45363, Indonesia
5. Department of Marine Science, Universitas Padjadjaran, Sumedang 45363, Indonesia