Serasinghe, K.H.; Galagama, I.K.; Gunathilaka, S.N.(5th National Conference on Applied Social Statistics (NRCASS) - 2019, Department of Social Statistics, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2019)
Wijesinghe, D.P.S.; Jayawardane, V.P.T.(International Conference on Applied Social Statistics (ICASS) - 2019, Department of Social Statistics, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2019)