Perera, A.P.D. N.; Malagala, D.K.M.; Rasanjalee, M.; Pathirana, P.T.; Ranathunga, R. R. A. L. W.
(5th National Conference on Applied Social Statistics (NRCASS) - 2019, Department of Social Statistics, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2019)