Yuyun Hidayat, Sukono, Wahyuddin, Nunung Nurhasanah, Jumadil Saputra,, 1Department of Mathematics Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, 45363 Jatinangor, Indonesia 2Faculty of Economics and Business, Universitas Malikussaleh, Lhokseumawe, Aceh, Indonesia 3Faculty of Economics and Business, Universitas Singaperbangsa, Karawang, 41362 Jawa Barat, Indonesia 4School of Social and Economic Development, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia 5Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, 45363 Jatinangor, Indonesia