Dr.N. Varathan

• Head, Department of Mathematics and Statistics, From September 2023
• Ph.D in Statistics (University of Peradeniya, Sri Lanaka, 2020).
• M.Sc in Statistics (Memorial University, Canada, 2012).
• M.Sc in Statistics (University of Peradeniya, Sri Lanaka, 2010).
• B.Sc (Hons) in Statistics (University of Jaffna, Sri Lanka, 2005).

• Coordinator(Mathematics & Statistics), Applied Science Degree Programme (Sep 2020 – to date), Faculty of Science.
• Academic Counsellor (Sep 2020 – to date), Faculty of Science.
• Student Counsellor (Mar 2020- Feb 2021), Faculty of Science.

•  “Prof. Kanagasabapathy Memorial Prize” in Statistics for the best performance in the Honours Degree Examination in Science, University of Jaffna, 2003.
• “University Prize” for the best performance in the Second Examination in Science, University of Jaffna, 2001.
• “Handy Perinpanayagam Memorial Prize” for the best performance in the First and Second Examination in Science, University of Jaffna, 2000/2001.
• “Postgraduate Institute of Science Prize” for the best performance in the M.Sc. Course work in Applied Statistics, University of Peradeniya, 2008/2009.

• Coordinator of Statistics subject, Department of Mathematics and Statistics, University of Jaffna, 2016 to 2018.
• Member of Editorial board of “Vingnanam Journal of Science”, University of Jaffna – 2017 to date.
• Member of the Science Faculty Research Committee (SFRC), University of Jaffna – 2017 to 2020.
• Life member of the Jaffna Science Association, Jaffna, Sri Lanka.
• Co-coodinator for Career Fair under HETC, faculty of Science, University of Jaffna, (2014).
• Member of Editorial board of “ Vingnanam International Research Conference (VIRC2018)”, Faculty of Science, University of Jaffna-2018.
• Science Faculty Representative  for HETC Project Monitoring committee, University of Jaffna (2014).
• Visiting Lecturer for the Open University of Sri Lanka in 2016 and 2017.
• Member of Science Faculty Career Guidance Cell, University of Jaffna – 2015 to 2018.
• Chairman, Technical Evaluation Committee, QIG-Physical Science study programme, University of Jaffna (2014).
• Secretary, Jaffna University Science Teachers’ Association (JUSTA), University of Jaffna (2014).

Undergraduate Teaching

• STA303M3 – Categorical Data Analysis
• STA404M3- Generalized Linear Models for Familial Longitudinal Data
• STA408M3 – Theory of Linear models
• STA201G3 – Statistical Theory
• STA103G3 – Basic Statistical Inference
• STA301G3 – Regression Analysis

Inter-faculty Teaching

• Statistical Methods for Planning (APNC 22023), Faculty of Arts, University of Jaffna, (2015).
• Pharmaceutical Mathematics (PHAMM 2101), Faculty of Allied Health Sciences, University of Jaffna, (2013).

2022.

• Varathan, N., (2022). An improved ridge type estimator for logistic regression, Statistics in Transition. New Series, 3, 113-126.
• Amarasinghe, R.K.R.K., Varathan, N. (2022). Time series analysis of crime data of Anuradhapura district, Sri Lanka, Proceedings of the Postgraduate Institute of Science Research Congress, University of Peradeniya, October 28-30, pp.71.
• Rajakaruna, R.R.S.P., Varathan, N. (2022). Farmers’ Loyalty towards Paddy Cultivation in Anuradhapura District, Sri Lanka, Proceedings of the 5^th National Symposium on Agriculture. Eastern University of Sri Lanka (5^th NSA 2022), March 30, pp.10.
• Wimalarathna, J.J.R., Varathan, N. (2022). Time series modelling of tourist arrivals to Sri Lanka: ARIMA approach, Proceedings of the 6^th International Research Conference of Uva Wellassa University, IRCUWU 2022, July 28-29, pp.185.

2021

• Varathan, N., Keshini, J.L. (2021). Identifying Risk Factors of Total Cholesterol Level of Patients in Kegalle District, Sri Lanka, 8th International Conference of Sabaragamuwa University of Sri Lanka 2021, p.p. 145.
• Varathan, N., Balasooriya, K.B.W.P., Statistical Analysis of the Impact of Macro-Economic Variables on Gross Domestic production in Sri Lanka, iPURSE 2021, p.p. 478.
• Varathan, N., Subasinghe, S.N.D.H., Statistical Analysis on Factors Influencing Child Injuries in Colombo, Sri Lanka, iPURSE 2021, p.p. 471.
• Mathangi, M.,Varathan, N., Pediction of Green Chilli production in Jaffna, Sri Lanka: ARIMA Approach, International Symposium on Agriculture & Environment 2021, p.p.86.

2020

• Liyana Arachchi, L.A.D.D., Varathan, N., (2020). Statistical analysis on factors affecting income-inequality in Sri lankan labour force, Proceedings of the 7^th Ruhuna International Science & Technology Conference, University of Ruhuna, January 22,61.
• De Zoysa, W.D.W., Varathan, N., (2020). Time Series Modeling of blood in demand for Kurunegala district, Sri Lanka, Proceedings of the International Research Conference of Uva Wellassa University, July 29-30,195.

2019

• Varathan, N., Wijekoon, P., (2019). Modified almost unbiased Liu estimator in logistic regression, Communications in Statistics-Simulation and Computation, DOI: 10.1080/03610918.2019.1626888.
• Varathan, N., Wijekoon, P. Optimal stochastic restricted logistic estimator. Stat Papers 62, 985–1002 (2021). https://doi.org/10.1007/s00362-019-01121-y
• Varathan, N., Wijekoon, P., (2019). Mean square error comparison of Almost unbiased ridge estimator and Modified almost unbiased ridge estimator in logistic regression, Proceedings of the PGIS Research Congress, University of Peradeniya, pp.35.
• Kirisanth, S., Varathan, N., Arumairajan, S., (2019). Time Series Modelling of Monthly Rainfall in Killinochchi District, Sri Lanka, Proceedings of the International Research Conference of Uva Wellassa University, 7-9 February, 2019. pp.44.

2018

• Varathan, N., Wijekoon, P., (2018). Optimal Generalized Logistic Estimator, Communications in Statistics-Theory and Methods , 47:2, 463-474, DOI: 10.1080/03610926.2017.1307406
• Varathan, N., Wijekoon, P., (2018). Liu-Type logistic estimator under Stochastic Linear Restrictions, Ceylon Journal of Science 47(1): 21-34. DOI: http://doi.org/10.4038/cjs.v47i1.7483
• Pathirana, H. and Varathan, N. (2018) Statistical Analysis of Variables Influencing Type of Birth in Sri Lanka: A Logistic Regression Approach. Open Journal of Statistics, 8, 317-326. doi: 4236/ojs.2018.82020.
• Herath, H.M.R.D.S., Varathan, N., (2018). Statistical modelling of monthly electricity sales in Colombo: ARIMA approach, Proceedings of the 3^rd International Research Symposium on Pure and Applied Sciences (IRSPAS-2018), University of Kelaniya, 26^th October, 2018. pp.78.
• Mirojan, U., Varathan, N., Arumairajan, S., (2018). Time series modelling of re onion production in Jaffna, Sri Lanka, Proceedings of the 3^rd International Research Symposium on Pure and Applied Sciences (IRSPAS-2018), University of Kelaniya, 26^th October, 2018. pp.79.

2017

• Varathan, N., Wijekoon, P., (2017). A stochastic restricted almost unbiased ridge estimator in logistic regression, Proceedings of the iPURSE,University of Peradeniya, 24th, November, 2017. pp.36
• Varathan, N., Wijekoon, P., (2017). Performance of the almost unbiased Liu- estimator in logistic regression under exact linear restrictions, Proceedings of the PGIS research Conference, University of peradeniya, 8-9, September, 2017. pp.49
• Nimantha, D.J., Varathan, N., (2017). Factors associated with low birth weight babies in Jaffna,Sri Lanka, Proceedings of the International Research Symposium on Pure and Applied Sciences (IRSPAS-2017), University of Kelaniya, 20^th October, 2017. pp.71
• Wicramarathna, W.AD.S., Varathan, N., Arumairajan, S (2017). Time series modelling of Tea production of Sri Lanka, Proceedings of the Vavuniya Campus International Research Symposium (VCIRS-2017), 9^th August, 2017. pp.49

2016

• Varathan, N., Sutradhar, B. C., Jowaheer, V., Biswas, A., (2016). Inferences in median regression models for asymmetric longitudinal data: A quasi-likelihood approach, Brazilian Journal of probability and Statistics, 30(1), 28-46.
• Varathan, N., Wijekoon, P., (2016). Ridge Estimator in Logistic Regression under stochastic linear restriction.  British Journal of Mathematics and Computer Science. 15 (3), 1. DOI: 10.9734/BJMCS/2016/24585
• Varathan, N. and Wijekoon, P.  (2016) . On the Restricted Almost Unbiased Ridge Estimator in Logistic Regression. Open Journal of Statistics, 6, 1076-1084.  http://dx.doi.org/10.4236/ojs.2016.66087
• Pathirana H.P.R.R Varathan N, (2016), Identifying the influential factors for type of birth. Proceedings of the Wayamba University International Conference, 19-20, August, 2016. pp.36

2015

• Renuraj, S., Varathan, N., Satkunananthan, N., (2015). Fcators influencing traffic accidents in Jaffna,. Sri Lankan Journal of Applied Statistics. 16(2), 117-133.
• Nagarajah, V., Wijekoon, P., (2015). Stochastic Restricted Maximum Likelihood Estimator in Logistic Regression Model. Open Journal of Statistics. 5, 837-851.
• Vinothini and  N. Varathan, ‘‘Modelling and forecasting of Crude oil price’’, Proceedings  of the International Conference on Multidisciplinary Approaches , Faculty of Graduate studies, University of Sri Jayewardenepura , p168, (2015).
• Premini and  N. Varathan, “Analysis of stock prices using Markov chain’’, Proceedings  of the International Conference on Multidisciplinary Approaches , Faculty of Graduate studies, University of Sri Jayewardenepura , p173, (2015).

2014

• Renuraj, N. Varathan, and N. Satkunananthan, “Factors influencing traffic accidents in Jaffna’’, Proceedings of the Wayamba International Conference , Wayamba University of Sri Lanka , p313, (2014).
• Kanisda, N. Varathan, and S. Arivalzahan, “A roboust scaling method for G.C.E (A/L) examination’’, Proceedings of the Wayamba International Conference , Wayamba University of Sri Lanka , p60, (2014).

2010

• Varathan, K. Perera, and N. Wikramanayake, “Statistical modeling of extreme rainfall in Colombo’’, Proceedings of the International Conference on Sustainable Built Environment (ICSBE-2010) , University of Peradeniya, Sri Lanka, pp., (2010).