**Dr.N.Varathan**

B.Sc. [Hons] (Jaffna), M.Sc (Canada), M.Sc (Pera), Ph.D(Pera).

- Senior Lecturer in Statistics
- varathan@univ.jfn.ac.lk
- 0779352990

- 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*61.^{th}Ruhuna International Science & Technology Conference, University of Ruhuna, January 22, - 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).