Academic Staff member

Dr. W. A. R. De Mel

Senior Lecturer Grade I

B.Sc University of Kelaniya, Sri Lanka
M.Phil University of Ruhuna, Sri Lanka
M.Sc Sam Houston State University, USA
M.Sc Missouri University of Science and Technology, USA
Ph.D Missouri University of Science and Technology, USA
Exam P Society of Actuaries
Exam FM Society of Actuaries
Exam MLC Society of Actuaries

ajith@maths.ruh.ac.lk
0412222681/14101

LinnkedIn ResearchGate Google Scholar

  • Parametric and Nonparametric Methods in Survival Analysis
  • Recurrent Events
  • Robust Statistics
  • Financial Time Series and Actuarial Science

    Journals

  • W.A.R. De Mel, A Hybrid Framework for Value at Risk Predictions Using Causal AI and Liquid State Neural Networks (Submitted)
  • Bandara, W.M.S and De Mel, W.A.R., (2024), Evaluating the Efficacy of Supervised Machine Learning Models in Inflation Forecasting in Sri Lanka, American Journal of Applied Statistics and Economics (AJASE) ), Volume 3, Issue 1, 51-60
  • Bandara, W.M.S and De Mel, W.A.R., (2023), Machine Learning Approaches for Forecasting Inflation: Empirical Evidence from Sri Lanka, Ruhuna Journal of Science,Vol (14) No. 1 p.29-49
  • Bandara, W.M.S and De Mel, W.A.R., (2024), Forecasting Nonlinear Time Series with ARIMA, ANN, and Hybrid Models: A Case Study in Inflation Rate Forecasting in Sri Lanka (Revised paper submitted)
  • Value at Risk(VaR) of Stock Market Returns Using Hidden Markov and LSTM Hybrid Model (Revised paper submitted, 2024)
  • Sachith N. Yamannage, W. A. R. De Mel (2024), Geospatial Analysis for Choosing Suitable Location to Start Hotel in Sri Lanka using Machine Learning, Sri Lankan Journal of Applied Sciences, Volume 3, Issue 1, Pages 29-36
  • Bandara, W.M.S and De Mel, W.A.R., (2023), Evaluating the Predictive Performance of Monthly Inflation Rates in Sri Lanka using the Hybrid Model (HB), Asian Journal of Probability and Statistics, Volume 25, Issue 4, Page 1-14
  • Robust analogs of Kaplan-Meier Estimators in Survival Analysis via Simulation Studies (In preparation)
  • De Mel, W.A.R, Likelihood Based Confidence Intervals for Survival Probablilties with Recurrent Event Data (submitted)
  • De Mel, W.A.R, Analysis of Seam Strength of Double Thread Chain Stitch in a Superimposed Woven Fabric Seam Assembly, Ceylon Journal of Science, 54(1), 2025:17-24
  • De Mel W.A.R., and Samarakoon N.Y.J.W., Impact of Determinants of Life Expectancy at Birth Using Shrinkage and Dimensionality Reduction Techniques, (2021), Rajarata University Journal, Vol 6 (II), 56-66
  • De Mel, W.A.R, and Chathurangani W.A.P.A,Modelling non-life insurance in Sri Lanka using Cox Hazard Model and classification of risky customers, 2020, Ruhuna Journal of Science,Vol 11 (2) 118-130
  • De Mel, W.A.R, Survival time data and their first statistical analysis: Review (2018), Journal of University of Ruhuna, Vol 6 (1)1-7
  • Adekpedjou, A., De Mel, W. A. R. and Zamba, K. D. (2015) A Chi-Square Goodness of Fit Test Based on Random Cells with Recurrent Events, Scandinavian Journal of Statistics Theory and Applications, 42(4), 1045-1064
  • De Mel, W. A., Adekpedjou, A. and Zamba, K. D. A Random Cells-Based Chi-Square Test with Recurrent Event Data, Proceedings of the Joint Statistical Meetings, Montréal, Canada, August 2014
  • Adekpedjou, A., Stocker, Russell and De Mel, W. A. R. (2013) A Class of Inferences Procedures for Validating the Generalized Koziol-Green Model with Recurrent Events, Computational Statistics and Data Analysis, 62, 83-92
  • Wedagedara, J. R. and De Mel, W. A. (2006) Some Politics and Statistical Physics Behind a 1994 Crash in Colombo Stock Market, Ruhuna Journal of Science, Vol-I, 133-147
  • Outstanding Graduate Student in Statistics, 2008, Department of Mathematics and Statistics, Sam Houston State University, Huntsville, Texas 2008
  • Head of the Department - Department of Mathematics,Faculty of Science, University of Ruhuna - from 2016-05-01 to 2019-05-01
  • Member of Senate - University of Ruhuna - from 2016-05-01 to 2019-05-01
  • Member of Board of Studies - Faculty of Science, University of Ruhuna. - from 2016-05-01 to 2019-05-01
  • Head of the Department - Department of Computational Mathematics, Faculty of Computing General Sir John Kotelawala Defence University - from 2020-02-01 to 2021-02-01
  • Member of Senate - General Sir John Kotelawala Defence University - from 2020-02-01 to 2021-02-01
  • Student Counsellor - Faculty of Science, University of Ruhuna
  • Joint Secretary of the Ruhuna University Science Teachers’ Association - Faculty of Science, University of Ruhuna
  • A representative of Students Request Committee - Faculy of Science, Universirty of Ruhuna