Jayathilake, W. M. L. D.; Kulathunga, K. M. N. P.; Liyanage, K. D.; Jananjana, W. W. L. C.; Madhushani, L. P. I. S.
(5th National Conference on Applied Social Statistics (NRCASS) - 2019, Department of Social Statistics, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2019)