- Faculty of Engineering
- Department of Mathematics
- Senior Professor
CV
Contact information
Address
Department of Mathematics
Faculty of Engineering
University of Moratuwa
Moratuwa
10400
Office
Extension
-
Primary Email
sarathp@uom.lk
Teaching and Administrative Activities
Teaching
Applied Statistics -Undergraduate -2016
Linear Model and Multivariate Analysis -Undergraduate -2016
Time Series & Stochastic Process -Undergraduate -2015
Probability and Statistics -Postgraduate -2016
Statistical Modeling in Business -Postgraduate -2016
Time Series Analysis for Business Forecasting -Postgraduate -2016
Applied Multivariate Techniques in Business -Postgraduate -2016
Analysis of Categorical data in Business -Postgraduate -2015
Multivariate Analysis -Postgraduate -2016
Administrative Activities
Course Coordinator -M Sc in Business Statistics (2016 To 2018)
Research Activities
Research Interests
Applied Statistics
Key Research Areas
Time Series , Regression Analysis , Survey Analysis, Climate Change Analysis and Assessment, Applications of Multivaraite Statistics
Education and Professional Affiliations
Education
Bachelors, University Of Colombo ,1980 Statistics and Mathematics
Masters, University of Canterbury ,1985 Statistics
PhD, University of Coombo ,1996 Applied Statistics
Professional Affiliations
Fellow of the Institute of Applied Statistics Sri Lanka (2016 To date)
Fellow of Royal Statistics Society(1997 To date)
Member - Institute of Applied Statistics in Sri Lanka IASSL(1995 To date)
Career
Professional Activities
Member of the Board of Study in Bio-Statistics at the Post Graduate Institute of Agriculture (PGIA), University of Peradeniya, Sri Lanka
Member of the Research Evaluation Committee of the Hector Kobbekaduwa Agrarian Research and Training Institute (HARTI)
Statistical Advisor for HARTI
Statistical Advisor - Antileprosy Campaign, Ministry of Health
Statistical Advisor - Department of Census and Statistics, Sri Lanka
Member, Technical Advisory Committee of the Center for Climate Change Studies (CCCS), Department of Meteorology in 2001/2002
Member, Working Group of the National Action Plan on Climate Change
Honours and Awards
Publications*
Journal Publications
2) Razmy A.M,".Comparison of Rectangular and Elliptical Control Region EWMA Schemes for Joint Quality Monitoring.",Open Journal of Statistics,4(11) 970-976,2014
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Mathugama S. C. and Peiris T S G (2011). Critical Evaluation of Dry Spell Research. International J of Basic and Applied Sciences, 11 (6), 153-160
Peiris, T. S. G., Hansen, J. W and Lareef, Zubair (2008). Use of seasonal climate information to predict coconut production in Sri Lanka. International. J of Climatology, 28: 103-10.
Siriwardena, P. H. A., Fernando, L. C. P. and Peiris, T. S. G. (2005). A new method to estimate the population size of coconut mite on a coconut nut. J. of Experimental and Applied Acarology, Nertherlands. 37, 123-129.
Marikkar, J. M. N., H. M. Ghazali, Y.B. Che Man, Peiris, T. S. G. and O.M. Lai. (2005). Distinguishing lard from other animal fats in admixtures of some vegetable oils using liquid chromatographic data coupled with multivariate data analysis. Food Chemistry, 91, 5-14.
Marikkar, J. M. N., H. M. Ghazali, Y.B. Che Man, Peiris, T. S. G. and O.M. Lai. (2005). Use of gas liquid chromatography in combination with pancreatic lipolysis and multivariate data analysis techniques for identification of lard contamination in some vegetable oils Food Chemistry, 90, 23-30
Fernando, L.C.P., Aratchige, N. S., Peiris, T. S. G. (2003). Distribution patterns of coconut mite, Aceria guerreronis and its predator Neoseiulus aff. paspalivorus in coconut palms. J.of Experimental and Applied Acarology. 31, 71-78.
Peiris, T. S. G. and Thattil, R. O. (1998). The study of climate effects on the nut yield of coconut using parsimonious models. J. of Experimental Agriculture, 34, 189-206.
Peiris, T. S. G., Thattil, R. O., and Mahindapala, R. (1995). An analysis of the effect of climate and weather on coconut (Cocos nucifera). J. of Experimental Agriculture, 31 (4), 451-460.
Peiris, T. S. G.(1993). Statistical analysis of field experiments in coconut using fewer recordings, J. of Experimental Agriculture. (29), 207-213.
Wickramananda, I R, Peiris, T S G, Neil Fernando, Fernando, L C P and Edgington, S. (2007). Impact of the coconut mite (Acerria guerreronis Keifer) on the coconut industry in Sri Lanka. International J of Coconut R & D (Cord),Indonesia, 23(1), 1-16.
Peiris T. S. G., K. P. Waidayaratne,. Samita S. and R. O. Thattil (2007). Control of spatial effect due to neighboring palms in coconut (Cocos Nucifera). International Journal on Coconut R & D (CORD), 23(2), 46-57.
Pathirage Anuradha Niranji, D P. and Peiris, T S G. (2007). Integrated Time Series Model to Forecast Monthly Nut Price of Coconut. Sri Lankan Journal of Applied Statistics, 8, 83-94
Kularatne, J D J S, Peiris, T. S. G. and Samita S. (2006). Feasibility of single palm plot in coconut experimentation. Journal of Tropical Agricultural Research, 18, 55-62.Waidyarathne K.P, Peiris T.S.G and Samita S. (2006). Shift in onset of first inter monsoon rain in coconut growing areas in Sri Lanka. Journal of Tropical Agricultural Research, 18, 1-12.
Peiris, T.S.G. (2005). Spatial aggregation of multidisciplinary data. Sri Lankan J of Applied Statistics, 5, 29-50.
Peiris, T. S. G., Fernando, M . T. N. and Samarajeewa, S. (2004). Factors influencing the use of coconut oil by the householders in Sri Lanka and their policy relevance to popularize the consumption, International Journal of Coconut Research & Development(Cord), Indonesia. 20 (2), 12-20.
Piyasiri, C. H., Peiris, T. S. G. and Samita S. (2004). Change in rainfall and temperature of Low Country Wet Intermediate (IL1) Region of Sri Lanka. Journal of Tropical Agricultural Research, 16, 271-280.
Peiris, T. S. G., Peiris, T. U. S., and Rajapaksha, S. (2000). Prediction of annual national coconut production - a stochastic approach. Sri Lanka J of Applied Statistics, 1 (1), 25-32.
Peiris, T. U. S., Peiris, T. S. G,, and Samita. S (2000). Arrival of south-west monsoon rains. Journal of Tropical Agricultural Research, 12, 265-275.
Peiris, T. S. G.,Fernando, M. T. N. and Waidyanatha, U. P. de S (2001). Factors influencing the productivity of coconut estates. J. of Coconut Research and Development (Cord), Indonesia, 17(2), 36 – 48.
Peiris, T. S. G. and Thattil, R. O. (1997a). Assessment of the effects of environmental factors on yield of coconut. Cocos (Journal of the Coconut Research Institute, Sri Lanka) 12, 1-18.
Peiris, T. S. G. and Thattil, R. O. (1997b). Alternative methods to determine optimal plot size for perennial tree crops. Cocos, 12, 44-54.
Peiris, T. S. G. and Thattil, R. O. (1996). Application of agroclimatology to some aspects of Coconut research. J. Plant. Crops (Supplement) in India, 24, 24-35.
Peiris, T. S. G. and Thattil, R. O. (1994). An alternative model to estimate solar radiation. Cocos , 10, 26-34.
Peiris, T. S. G. and Pieris, R. A. A. (1991). The effect of bimonthly rainfall on coconut yield in the Semi Dry Intermediate Zone (ILl) in Sri Lanka. Cocos, 9, 1-11.
Peiris, T. S. G. (1989). Forecasting the crop yield of a coconut estate. International J. of Coconut Research & Development (Cord), Indonesia 5(2), 67‑77.
Peiris, T. S. G. and Senaviratne, E. K. (1989). An alternative approach for analysis of data from a long term experiment. Cocos, 7, 14-20.
Peiris, T. S. G. and Stern, R. D. (1988). Use of statistics package `SAS' in an agricultural research institute: a case study from CRI, Sri Lanka. Cocos. 6, 38‑52.
Mathugama C S and Peiris T S G (2010) Forecasting critical dry spell lengths in Anamaduwa. Proceedings of the 16th Annual Symposium of the Faculty of Engineering, 240-241.
Waidyaratne, K. P., Peiris, T. S. G and Samita S. (2010). Significance Changes of Seasonal Rainfall in Coconut Growing Area in Sri Lanka. In Proceedings of the 3rd Symposium on Plantation Crop Research. - 214-223, (Eds: R S Dharmakeerthi and A M W K Senevitahna), 30 September-01 October, Cinnamon Garden Hotel, Colombo, Sri Lanka
Mathugama C S and Peiris T S G (2009) . Forecasting Dry Spells in DL1 - A Case study from Anamaduwa. Proceedings of the 15th Annual Symposium of the Faculty of Engineering, 123-124.
Peiris, T S G(2008) Impacts Assessment due to Climate Change on the Coconut Industry in Sri Lanka. Proceedings of the 14th Annual Symposium of the Faculty of Engineering, 24-25
Peiris, T. S. G.(2005). Role of statisticians towards disaster management in climate. 28-35 pp, Proceedings of the 6th Annual General Meeting of the Applied Statistics Association of Sri Lanka, Prof. V K Samaranayake Auditorium, University of Colombo, Colombo, Sri Lanka.
Peiris T. S. G. (2004). Forecasting coconut production: issues, approaches, and challenges. In Proceedings of the International Conference of Coconut Research Institute of Sri Lanka – Part I (Review papers and guest presentations), 111 – 147 (Eds: T S G Peiris and C S Ranasinghe). The Coconut Research Institute of Sri Lanka, Lunuwila 61150, Sri Lanka.
Piyasiri, C. H., Peiris, T. S. G and Samita S. (2004). Empirical prediction of maximum and minimum air temperature in Sri Lanka. In Proceedings of the International Statistical Conference: Visions of futuristic methodologies. 371-379, (Eds: Basil M de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Postgraduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris T. S. G. and Mathes, D. T. (1997). The Analysis of long term rainfall variability at selected location in Sri Lanka. Proceedings of the International Congress on Modelling and Simulation, 06-11 December, 1997, Hobart, Australia. 69-74.
Peiris, T. S. G. (1993). The degree of influence of rainfall on coconut. Advances in coconut research and development, 413-420, (Eds. Nair, M. K., Khan, P. H., Gopalasundram, P. & Bhaskara Rao, E. V. V.). Oxford & IBH Publishing Co. Pvt. Ltd.
Peiris and Peiris, T S G (2011) Measuring Stock Maron Business and Information. Faculty of Commerce and Management Studies, University of Kelaniya.
Mathugama, S. C. and Peiris, T. S. G. (2010). Minimizing of vulnerability caused by extended dry spells. Proceeding of the 2nd National Symposium on Disaster Risk Reduction and Climate Change Adaptation, 13-14 October, Sri Lanka Foundation Institute, Sri Lanka, 14p
Peiris T S G (2010). A study of future climate in Sri Lanka. Proceedings of the 2nd National Symposium on Disaster Risk Reduction & Climate Change Adaptation, 13-14 October, SLFI, Colombo, 47p
Mathugama, S. C. and Peiris, T. S. G. (2009). Analysis of the occurrence of dry spells in the DL2 region of Sri Lanka, Proceeding of the International Statistics Conferece, 8-10 January, Sri Lanka Foudation Institute, Sri Lanka, 10p
D. C. Wickramarachchi, S. Samita and Peiris, T. S. G. (2009). An Algorithm to detect over-dispersion in multinomial data. Proceeding of the International Statistics Conferece, 8-10 January, Sri Lanka Foudation Institute, Sri Lanka, 21p
Peiris, T. S. G.(2006). Impact of climate change on coconut industry in Sri Lanka. Paper presented at the 3rd International conference on Climate Impact and Assessment (TICCIA), 24-27 July, Cairns, Australia.
Kularatne, J. D. J. S.,Peiris, T. S. G. and Mathes, D. T. (2004). Long-term climate variability in Hamb antota. 71, In Proceedings of the International Sri Lankan Statistical Conference. (Eds: Basil M. de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Post Graduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris, T. S. G., Larref Zubair, Piyasiri, C. H. (2004). Forecasting national coconut production – a novel approach. In Proceedings of the International Sri Lankan Statistical Conference. (Eds: Basil M. de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Post Graduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris T. S. G.,Madawala Wijeratne, Aanadacumaraswamy, A. Ranasinghe, C. S., Jayakody, A. and Fernando, M. T. N. (2004). Impact of climate change in Sri Lanka on coconut and tea industry. Paper presented at the 2nd AIACC Asia and the Pacific Regional workshop on assessment of climate change impacts. 2-5 November, Traders hotel, Passay City, Philippines.
Peiris, T. S. G. and Kularatne, J. D. J. S. (2004). Analysis of climate change in Hambantota district in Sri Lanka. In Proceedings of the International conference on Sustainable Water Resources Management in Changing Environment of the Monsoon Region (Eds: Srikantha Herath, Assela Pathirana and S. B. Weerakoon), 17-19, November, BMICH, Colombo, Sri Lanka.
Peiris, T. S. G. and Janet Riley (2002). Aggregation of multidisciplinary indicators in space. Proceeding of the International Biometrics Conference held during 21–26 July, Freiburg, Germany,
Peiris, T. S. G.,Pramudita, W. and Abenayake, R (2002). Reduction of experimental error in coconut trials. Proceeding of the International Biometrics Conference held on 21 – 26 July, Freiburg, Germany.
Peiris, T. S. G. (2002). Effect of temporal scale aggregation on climate change studies”. Proceeding of the International Workshop on Regional Integrated Assessment of Climate Impacts held at the IL_CIOCCO Hotel, 16-20 September, Castelvecchio Pascoli, Italy.
Peiris, T. S. G. and Fernando, M. T. N. (2000). Trend in nut production and utilization. Proceedings of the conference on coconut industry - meeting the new challenges. 27 June, BMICH, Colombo.
Fernando, M. T. N. and Peiris, T. S. G. (2000).Some economic consideration of coconut production and processing.Proceedings of the conference on coconut industry - meeting the new challenges, 27 June, BMICH, Colombo.
Peiris, T. S. G. (2000). The role of coconut industry in Sri Lanka towards the world trend on kernel products. The Proceeding of the International Conference on Plantation Crops, Green Park, Hyderabad, India, 21p.
Fernando, M. T. N. and Peiris, T. S. G. (2000). Import duty reduction for substitute oils and its implications on coconut oil industry in Sri Lanka. The Proceeding of the International Conference on Plantation Crops, Green Park, Hyderabad, India, 22p.
Somasiri, L . L. W., Peiris, T. S. G., Wijebandara, D .M. D. I., and Bandara, E. M. A. T. (1999). Status of exchangeable bases of the upland soils of the Kurunegala catena of the coconut triangle. Proceedings of the 55th Annual Session of the SLAAS, 57 pp.
Peiris T. S. G.(1999). Astochastic model to predict national coconut yield. Proceedings of the International Symposiumon Forecasting, 27-30 June, 1999, Washignton D C, USA. 35p.
Peiris, T. S. G.and Thattil, R. O. (1997). Climate analysis - the effect of climate on coconut. Proceedings of the National Symposium of Climate Change, 7-8 March, Colombo, Sri Lanka.
Peiris, T. S. G. and Mathes, D. T. (1997). Rainfall changes scenarios in coconut growing areas in Sri Lanka. Proceedings of the National Symposium of Climate Change, 7-8 March, Colombo, Sri Lanka
Peiris, T. S. G. and Thattil, R. O. (1995). The analysis of climate system: Parsimonious crop-weather model. Proceedings of the 6th International Conference on Environmetrics, 6-9 December, Malaysia.
Peiris, T. S. G. (1997). Evaluation of subsidy programmes in coconut and technology transfer. A paper presented to the International Workshop on Technology Development and Transfer in Coconut, 1-5 April, Lunuwila, Sri Lanka
Peiris, T. S. G.and Thattil, R. O. (1994). Use of dimensional reduction methods for selection of variables in agro meteorology aspects on coconut. Proceedings of the International Conference of the Royal Statistical Society, held at the university of Newcastle Upon Tyne, 12-16 September, 121 p.
Peiris, T. S. G.and Thattil, R. O. (1994). Application of Agro meteorology to some aspects of coconut research. Proceedings of the International Symposium on Plantation Crops, held at the Calicut, Kerala, India, 30 November - 03 December, 5p.
Peiris, T. S. G. and Thattil, R. O. (1993). Estimation of solar radiation at Lunuwila (70 20' N, 710 53'E, 30.5 m). Proceedings of the 49th Annual Session of the SLAAS, 191 p.
Peiris, T. S. G. and Thattil, R. O. (1992). Determination of optimum plot size for coconut based on data from randomized complete block experiments. Proceedings of the Int. Biometrics Conference, held in 7-11 December in Hamilton, New Zealand, 179 pp.
Peiris, T. S. G. and Thattil, R. O. (1992). Alternative methods to determine the optimum plot size for tree crops. Proceedings of the 48th Annual Session of the SLAAS, 55 pp.
Peiris, T. S. G. (1991). Modeling approach in analyzing field experimental data in coconut. Proceedings of the 47th Annual Session of the SLAAS, 139 pp.
Peiris, T. S. G., Kularatne, J. D. J. S. & Mathes, D. T. (1990). CLIMATE: A user friendly program to analyse climatological variables for agricultural purposes". Proceedings of the 46th Annual Session of the SLAAS. 139 pp.
Peiris, T. S. G. and Senaviratne, E. K. (1989). The use of daily rainfall in analysis of the repeated measurements data. Proceedings of the 45th Annual Session of the SLAAS. 39 pp.
Peiris, T. S. G. (1989). An alternative approach to analyze the repeated measurements data in perennial crops. Proceedings of the conference on Statistics for Repeated Measurement in Italy from 6‑9 September, 1989, University of Paduva, Italy.
Jayasekara, K. S., Liyanage, M. de. S. and Peiris, T. S. G. (1988). Effect of intercropping on soil erosion and runoff in coconut lands. Proceedings of the 44th Annual Session of the SLAAS, 35 pp
Peiris, T. S. G.(1988). Software in micro computers for the analysis of designed experiments. Proceedings of the 8th National Computer Conference, Sri Lanka, 77 pp.
Peiris, T. S. G.(1987). SAS ‑ a micro computer software for agricultural research. Proceeding of the 43rd Annual Session of the SLAAS, 120 pp.
Peiris, T. S. G. (1986). Seasonal ARIMA model for forecasting crop‑wise coconut yield in a given estate. Proceedings of the 42nd Annual Session of the SLAAS, 174 pp.
Thilakasiri, M. A., Peiris, T. S. G. & Gunasekara, T. G. L. G. (1986). Some socio economic characteristics of coconut based farming systems. Proceedings of the 42nd Annual Session of the Sri Lanka Association of Advancement of Science (SLAAS), 197 pp.
Peiris, T. S. G. (2004). Short-term projections for coconut industry in Sri Lanka, Economic Review, Aug/Nov. 15-17
Peiris, T, S, G. Sri Lankans are using more palm oils than coconut oil.www.cri.lk
Peiris, T, S, G. Is there a real shortage of coconut? seedlings?- www.cri.lk
Peiris, T, S, G. & Kularatne, J D J S(2004).250 coconut palms are lost per day in Sri Lanka. - www.cri.lk
Peiris, T, S, G. (2007). Impact of coconut mite on the coconut industry- www.cri.lk
Peiris, T. S. G. & Gunaratne, L. H. P. (2008). Abstracts of the National Statistics Conference organized by the Applied Statistics Association of Sri Lanka (ASASL), 7 January, 1-14.
Peiris, T. S. G.& Ranasinghe, C. S. (2004). Preceding I (Reviews & Invited Papers) of the International Conference of the CRISL: Tree of Life – New Trends in the Millennium 1-281 pp. ISBN: 955-9013-03-3.
Peiris, T. S. G. & Ranasinghe, C. S. (2004). Abstracts of International Conference of CRISL 1-85.
Peiris, T. S. G.& Ranasinghe, C. S. (2005). Proceeding II (Contributed Papers) of the International Conference of the CRISL: Tree of Life - New Trends in the Millennium(1-361 pp). ISBN: 955-9013-03-3.
Books
Web archived publications
Reports for dissemination of knowledge and contributions to the national / international development:
Ranasinghe, C. S., Peiris,T. S. G., Jayawardena, J., Perera, L, Fernando, M. T. N. and Wickramananda, I. (2007). Coconut Palm Decline: An Assessment of the Prevalence and Probable Causes. 1-18 pp. Peiris, T. S. G., Henry Nimal Appuhamy, Nainanayake N. P. A. D, Bandaranayake C. K. and Fernando M. T. N. (2006). Coconut Research, Development and Dissemination of Technologies Growers Perception. 1-102pp. ISBN: 955 – 9013 – 06 - 8.
Peiris, T. S. G.and Fernando, M. T. N. (1999). Demand for Farm Managers in the Coconut Estate Sector. 1- 47pp.
Peiris, T. S. G. and Samarajeewa, S. (1997). Evaluation of Coconut Subsidy on Coconut Subsidy Programs. 1- 128pp
Somasiri, L. L. W., Peiris, T. S. G., Gunathilake, H. A. J., Fernando, M. T. N. and Pinto, J. L. J. G. (1993). An Appraisal of Coconut Growers' Reactions and observations on CRI Recommended Cultural Practices and Other Related Issues. 1-123pp.
Papers in Referred Indexed Journals (International):
Mathugama S C and Peiris T S G (2012). Spatial and Temporal Analysis of Critical Dry Spells in Sri Lanka. The International J of Climate Change: Impacts and Responses. Accepted for Publication.Mathugama S. C. and Peiris T S G (2011). Critical Evaluation of Dry Spell Research. International J of Basic and Applied Sciences, 11 (6), 153-160
Peiris, T. S. G., Hansen, J. W and Lareef, Zubair (2008). Use of seasonal climate information to predict coconut production in Sri Lanka. International. J of Climatology, 28: 103-10.
Siriwardena, P. H. A., Fernando, L. C. P. and Peiris, T. S. G. (2005). A new method to estimate the population size of coconut mite on a coconut nut. J. of Experimental and Applied Acarology, Nertherlands. 37, 123-129.
Marikkar, J. M. N., H. M. Ghazali, Y.B. Che Man, Peiris, T. S. G. and O.M. Lai. (2005). Distinguishing lard from other animal fats in admixtures of some vegetable oils using liquid chromatographic data coupled with multivariate data analysis. Food Chemistry, 91, 5-14.
Marikkar, J. M. N., H. M. Ghazali, Y.B. Che Man, Peiris, T. S. G. and O.M. Lai. (2005). Use of gas liquid chromatography in combination with pancreatic lipolysis and multivariate data analysis techniques for identification of lard contamination in some vegetable oils Food Chemistry, 90, 23-30
Fernando, L.C.P., Aratchige, N. S., Peiris, T. S. G. (2003). Distribution patterns of coconut mite, Aceria guerreronis and its predator Neoseiulus aff. paspalivorus in coconut palms. J.of Experimental and Applied Acarology. 31, 71-78.
Peiris, T. S. G. and Thattil, R. O. (1998). The study of climate effects on the nut yield of coconut using parsimonious models. J. of Experimental Agriculture, 34, 189-206.
Peiris, T. S. G., Thattil, R. O., and Mahindapala, R. (1995). An analysis of the effect of climate and weather on coconut (Cocos nucifera). J. of Experimental Agriculture, 31 (4), 451-460.
Peiris, T. S. G.(1993). Statistical analysis of field experiments in coconut using fewer recordings, J. of Experimental Agriculture. (29), 207-213.
Papers in Referred Journals (National and International):
Peiris, T. S. G. and Kularatne, J. D. J. S. (2008). Assessment of Climate Variability for Coconut and Other Crops: A Statistical Approach.International Journal of Coconut Research & Development (CORD). 24(1) 35-53
Kularatne, J. D. J. S., Peiris, T. S. G. and Samita, S. (2008). Impact of Covariate on Single Palm Plot Experiments in Coconut. InternationalJournal of Coconut Research & Development (CORD CORD, 24(2), 10-20.Cooray, T. M. J. A. and Peiris, T S G(2008). Day and Night, Electricity Load Forecasting for Peaks Values in Sri Lanka. Sri Lanka Journal of Applied Statistics, 9, 121-131.Wickramananda, I R, Peiris, T S G, Neil Fernando, Fernando, L C P and Edgington, S. (2007). Impact of the coconut mite (Acerria guerreronis Keifer) on the coconut industry in Sri Lanka. International J of Coconut R & D (Cord),Indonesia, 23(1), 1-16.
Peiris T. S. G., K. P. Waidayaratne,. Samita S. and R. O. Thattil (2007). Control of spatial effect due to neighboring palms in coconut (Cocos Nucifera). International Journal on Coconut R & D (CORD), 23(2), 46-57.
Pathirage Anuradha Niranji, D P. and Peiris, T S G. (2007). Integrated Time Series Model to Forecast Monthly Nut Price of Coconut. Sri Lankan Journal of Applied Statistics, 8, 83-94
Kularatne, J D J S, Peiris, T. S. G. and Samita S. (2006). Feasibility of single palm plot in coconut experimentation. Journal of Tropical Agricultural Research, 18, 55-62.Waidyarathne K.P, Peiris T.S.G and Samita S. (2006). Shift in onset of first inter monsoon rain in coconut growing areas in Sri Lanka. Journal of Tropical Agricultural Research, 18, 1-12.
Peiris, T.S.G. (2005). Spatial aggregation of multidisciplinary data. Sri Lankan J of Applied Statistics, 5, 29-50.
Peiris, T. S. G., Fernando, M . T. N. and Samarajeewa, S. (2004). Factors influencing the use of coconut oil by the householders in Sri Lanka and their policy relevance to popularize the consumption, International Journal of Coconut Research & Development(Cord), Indonesia. 20 (2), 12-20.
Piyasiri, C. H., Peiris, T. S. G. and Samita S. (2004). Change in rainfall and temperature of Low Country Wet Intermediate (IL1) Region of Sri Lanka. Journal of Tropical Agricultural Research, 16, 271-280.
Peiris, T. S. G., Peiris, T. U. S., and Rajapaksha, S. (2000). Prediction of annual national coconut production - a stochastic approach. Sri Lanka J of Applied Statistics, 1 (1), 25-32.
Peiris, T. U. S., Peiris, T. S. G,, and Samita. S (2000). Arrival of south-west monsoon rains. Journal of Tropical Agricultural Research, 12, 265-275.
Peiris, T. S. G.,Fernando, M. T. N. and Waidyanatha, U. P. de S (2001). Factors influencing the productivity of coconut estates. J. of Coconut Research and Development (Cord), Indonesia, 17(2), 36 – 48.
Peiris, T. S. G. and Thattil, R. O. (1997a). Assessment of the effects of environmental factors on yield of coconut. Cocos (Journal of the Coconut Research Institute, Sri Lanka) 12, 1-18.
Peiris, T. S. G. and Thattil, R. O. (1997b). Alternative methods to determine optimal plot size for perennial tree crops. Cocos, 12, 44-54.
Peiris, T. S. G. and Thattil, R. O. (1996). Application of agroclimatology to some aspects of Coconut research. J. Plant. Crops (Supplement) in India, 24, 24-35.
Peiris, T. S. G. and Thattil, R. O. (1994). An alternative model to estimate solar radiation. Cocos , 10, 26-34.
Peiris, T. S. G. and Pieris, R. A. A. (1991). The effect of bimonthly rainfall on coconut yield in the Semi Dry Intermediate Zone (ILl) in Sri Lanka. Cocos, 9, 1-11.
Peiris, T. S. G. (1989). Forecasting the crop yield of a coconut estate. International J. of Coconut Research & Development (Cord), Indonesia 5(2), 67‑77.
Peiris, T. S. G. and Senaviratne, E. K. (1989). An alternative approach for analysis of data from a long term experiment. Cocos, 7, 14-20.
Peiris, T. S. G. and Stern, R. D. (1988). Use of statistics package `SAS' in an agricultural research institute: a case study from CRI, Sri Lanka. Cocos. 6, 38‑52.
Conference Papers in Refereed Proceedings as full papers / extended abstracts:
Razmy A M and Peiris T S G (2012) A Standard Method to Compare the Combined Quality Monitoring Schemes Using Average Run Length Properties. Proceedings of the 2nd International Symposium of the South Eastern University of Sri Lanka. 25-27 May.. 172-174 pMathugama C S and Peiris T S G (2010) Forecasting critical dry spell lengths in Anamaduwa. Proceedings of the 16th Annual Symposium of the Faculty of Engineering, 240-241.
Waidyaratne, K. P., Peiris, T. S. G and Samita S. (2010). Significance Changes of Seasonal Rainfall in Coconut Growing Area in Sri Lanka. In Proceedings of the 3rd Symposium on Plantation Crop Research. - 214-223, (Eds: R S Dharmakeerthi and A M W K Senevitahna), 30 September-01 October, Cinnamon Garden Hotel, Colombo, Sri Lanka
Mathugama C S and Peiris T S G (2009) . Forecasting Dry Spells in DL1 - A Case study from Anamaduwa. Proceedings of the 15th Annual Symposium of the Faculty of Engineering, 123-124.
Peiris, T S G(2008) Impacts Assessment due to Climate Change on the Coconut Industry in Sri Lanka. Proceedings of the 14th Annual Symposium of the Faculty of Engineering, 24-25
Peiris, T. S. G.(2005). Role of statisticians towards disaster management in climate. 28-35 pp, Proceedings of the 6th Annual General Meeting of the Applied Statistics Association of Sri Lanka, Prof. V K Samaranayake Auditorium, University of Colombo, Colombo, Sri Lanka.
Peiris T. S. G. (2004). Forecasting coconut production: issues, approaches, and challenges. In Proceedings of the International Conference of Coconut Research Institute of Sri Lanka – Part I (Review papers and guest presentations), 111 – 147 (Eds: T S G Peiris and C S Ranasinghe). The Coconut Research Institute of Sri Lanka, Lunuwila 61150, Sri Lanka.
Piyasiri, C. H., Peiris, T. S. G and Samita S. (2004). Empirical prediction of maximum and minimum air temperature in Sri Lanka. In Proceedings of the International Statistical Conference: Visions of futuristic methodologies. 371-379, (Eds: Basil M de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Postgraduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris T. S. G. and Mathes, D. T. (1997). The Analysis of long term rainfall variability at selected location in Sri Lanka. Proceedings of the International Congress on Modelling and Simulation, 06-11 December, 1997, Hobart, Australia. 69-74.
Peiris, T. S. G. (1993). The degree of influence of rainfall on coconut. Advances in coconut research and development, 413-420, (Eds. Nair, M. K., Khan, P. H., Gopalasundram, P. & Bhaskara Rao, E. V. V.). Oxford & IBH Publishing Co. Pvt. Ltd.
Papers Presented at Conferences/Communications (in abstract form):
Alibuhtto M C and Peiris T S G (2012). Modelling CCPI Using Time Series ARIMA Model. Proceeding of the 1st Annual Research Conference - Emerging Issues in Management and Finance. Faculty of Management & Commerce, South Eastern University, 63pPeiris and Peiris, T S G (2011) Measuring Stock Maron Business and Information. Faculty of Commerce and Management Studies, University of Kelaniya.
Mathugama, S. C. and Peiris, T. S. G. (2010). Minimizing of vulnerability caused by extended dry spells. Proceeding of the 2nd National Symposium on Disaster Risk Reduction and Climate Change Adaptation, 13-14 October, Sri Lanka Foundation Institute, Sri Lanka, 14p
Peiris T S G (2010). A study of future climate in Sri Lanka. Proceedings of the 2nd National Symposium on Disaster Risk Reduction & Climate Change Adaptation, 13-14 October, SLFI, Colombo, 47p
Mathugama, S. C. and Peiris, T. S. G. (2009). Analysis of the occurrence of dry spells in the DL2 region of Sri Lanka, Proceeding of the International Statistics Conferece, 8-10 January, Sri Lanka Foudation Institute, Sri Lanka, 10p
D. C. Wickramarachchi, S. Samita and Peiris, T. S. G. (2009). An Algorithm to detect over-dispersion in multinomial data. Proceeding of the International Statistics Conferece, 8-10 January, Sri Lanka Foudation Institute, Sri Lanka, 21p
Peiris, T. S. G.(2006). Impact of climate change on coconut industry in Sri Lanka. Paper presented at the 3rd International conference on Climate Impact and Assessment (TICCIA), 24-27 July, Cairns, Australia.
Kularatne, J. D. J. S.,Peiris, T. S. G. and Mathes, D. T. (2004). Long-term climate variability in Hamb antota. 71, In Proceedings of the International Sri Lankan Statistical Conference. (Eds: Basil M. de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Post Graduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris, T. S. G., Larref Zubair, Piyasiri, C. H. (2004). Forecasting national coconut production – a novel approach. In Proceedings of the International Sri Lankan Statistical Conference. (Eds: Basil M. de Silva and Nitis Mukhopadhyay), 28-30 December 2004, Post Graduate Institute of Science, University of Peradeniya, Sri Lanka.
Peiris T. S. G.,Madawala Wijeratne, Aanadacumaraswamy, A. Ranasinghe, C. S., Jayakody, A. and Fernando, M. T. N. (2004). Impact of climate change in Sri Lanka on coconut and tea industry. Paper presented at the 2nd AIACC Asia and the Pacific Regional workshop on assessment of climate change impacts. 2-5 November, Traders hotel, Passay City, Philippines.
Peiris, T. S. G. and Kularatne, J. D. J. S. (2004). Analysis of climate change in Hambantota district in Sri Lanka. In Proceedings of the International conference on Sustainable Water Resources Management in Changing Environment of the Monsoon Region (Eds: Srikantha Herath, Assela Pathirana and S. B. Weerakoon), 17-19, November, BMICH, Colombo, Sri Lanka.
Peiris, T. S. G. and Janet Riley (2002). Aggregation of multidisciplinary indicators in space. Proceeding of the International Biometrics Conference held during 21–26 July, Freiburg, Germany,
Peiris, T. S. G.,Pramudita, W. and Abenayake, R (2002). Reduction of experimental error in coconut trials. Proceeding of the International Biometrics Conference held on 21 – 26 July, Freiburg, Germany.
Peiris, T. S. G. (2002). Effect of temporal scale aggregation on climate change studies”. Proceeding of the International Workshop on Regional Integrated Assessment of Climate Impacts held at the IL_CIOCCO Hotel, 16-20 September, Castelvecchio Pascoli, Italy.
Peiris, T. S. G. and Fernando, M. T. N. (2000). Trend in nut production and utilization. Proceedings of the conference on coconut industry - meeting the new challenges. 27 June, BMICH, Colombo.
Fernando, M. T. N. and Peiris, T. S. G. (2000).Some economic consideration of coconut production and processing.Proceedings of the conference on coconut industry - meeting the new challenges, 27 June, BMICH, Colombo.
Peiris, T. S. G. (2000). The role of coconut industry in Sri Lanka towards the world trend on kernel products. The Proceeding of the International Conference on Plantation Crops, Green Park, Hyderabad, India, 21p.
Fernando, M. T. N. and Peiris, T. S. G. (2000). Import duty reduction for substitute oils and its implications on coconut oil industry in Sri Lanka. The Proceeding of the International Conference on Plantation Crops, Green Park, Hyderabad, India, 22p.
Somasiri, L . L. W., Peiris, T. S. G., Wijebandara, D .M. D. I., and Bandara, E. M. A. T. (1999). Status of exchangeable bases of the upland soils of the Kurunegala catena of the coconut triangle. Proceedings of the 55th Annual Session of the SLAAS, 57 pp.
Peiris T. S. G.(1999). Astochastic model to predict national coconut yield. Proceedings of the International Symposiumon Forecasting, 27-30 June, 1999, Washignton D C, USA. 35p.
Peiris, T. S. G.and Thattil, R. O. (1997). Climate analysis - the effect of climate on coconut. Proceedings of the National Symposium of Climate Change, 7-8 March, Colombo, Sri Lanka.
Peiris, T. S. G. and Mathes, D. T. (1997). Rainfall changes scenarios in coconut growing areas in Sri Lanka. Proceedings of the National Symposium of Climate Change, 7-8 March, Colombo, Sri Lanka
Peiris, T. S. G. and Thattil, R. O. (1995). The analysis of climate system: Parsimonious crop-weather model. Proceedings of the 6th International Conference on Environmetrics, 6-9 December, Malaysia.
Peiris, T. S. G. (1997). Evaluation of subsidy programmes in coconut and technology transfer. A paper presented to the International Workshop on Technology Development and Transfer in Coconut, 1-5 April, Lunuwila, Sri Lanka
Peiris, T. S. G.and Thattil, R. O. (1994). Use of dimensional reduction methods for selection of variables in agro meteorology aspects on coconut. Proceedings of the International Conference of the Royal Statistical Society, held at the university of Newcastle Upon Tyne, 12-16 September, 121 p.
Peiris, T. S. G.and Thattil, R. O. (1994). Application of Agro meteorology to some aspects of coconut research. Proceedings of the International Symposium on Plantation Crops, held at the Calicut, Kerala, India, 30 November - 03 December, 5p.
Peiris, T. S. G. and Thattil, R. O. (1993). Estimation of solar radiation at Lunuwila (70 20' N, 710 53'E, 30.5 m). Proceedings of the 49th Annual Session of the SLAAS, 191 p.
Peiris, T. S. G. and Thattil, R. O. (1992). Determination of optimum plot size for coconut based on data from randomized complete block experiments. Proceedings of the Int. Biometrics Conference, held in 7-11 December in Hamilton, New Zealand, 179 pp.
Peiris, T. S. G. and Thattil, R. O. (1992). Alternative methods to determine the optimum plot size for tree crops. Proceedings of the 48th Annual Session of the SLAAS, 55 pp.
Peiris, T. S. G. (1991). Modeling approach in analyzing field experimental data in coconut. Proceedings of the 47th Annual Session of the SLAAS, 139 pp.
Peiris, T. S. G., Kularatne, J. D. J. S. & Mathes, D. T. (1990). CLIMATE: A user friendly program to analyse climatological variables for agricultural purposes". Proceedings of the 46th Annual Session of the SLAAS. 139 pp.
Peiris, T. S. G. and Senaviratne, E. K. (1989). The use of daily rainfall in analysis of the repeated measurements data. Proceedings of the 45th Annual Session of the SLAAS. 39 pp.
Peiris, T. S. G. (1989). An alternative approach to analyze the repeated measurements data in perennial crops. Proceedings of the conference on Statistics for Repeated Measurement in Italy from 6‑9 September, 1989, University of Paduva, Italy.
Jayasekara, K. S., Liyanage, M. de. S. and Peiris, T. S. G. (1988). Effect of intercropping on soil erosion and runoff in coconut lands. Proceedings of the 44th Annual Session of the SLAAS, 35 pp
Peiris, T. S. G.(1988). Software in micro computers for the analysis of designed experiments. Proceedings of the 8th National Computer Conference, Sri Lanka, 77 pp.
Peiris, T. S. G.(1987). SAS ‑ a micro computer software for agricultural research. Proceeding of the 43rd Annual Session of the SLAAS, 120 pp.
Peiris, T. S. G. (1986). Seasonal ARIMA model for forecasting crop‑wise coconut yield in a given estate. Proceedings of the 42nd Annual Session of the SLAAS, 174 pp.
Thilakasiri, M. A., Peiris, T. S. G. & Gunasekara, T. G. L. G. (1986). Some socio economic characteristics of coconut based farming systems. Proceedings of the 42nd Annual Session of the Sri Lanka Association of Advancement of Science (SLAAS), 197 pp.
Feature Articles:
Peiris, T S G(2010). Statistical Thinking Towards & Decision Making in Engineering Application. First Newsletter of the Mathematical Society , Dept. of Mathematics, University of MoratuwaPeiris, T. S. G. (2004). Short-term projections for coconut industry in Sri Lanka, Economic Review, Aug/Nov. 15-17
Peiris, T, S, G. Sri Lankans are using more palm oils than coconut oil.www.cri.lk
Peiris, T, S, G. Is there a real shortage of coconut? seedlings?- www.cri.lk
Peiris, T, S, G. & Kularatne, J D J S(2004).250 coconut palms are lost per day in Sri Lanka. - www.cri.lk
Peiris, T, S, G. (2007). Impact of coconut mite on the coconut industry- www.cri.lk
As an Editor in Conference Proceedings:
Peiris, T. S. G. & Gunaratne, L. H. P.. (2009). Abstracts of Contributed and Invited Papers, International Statistics Conference organized by the Applied StatisticsAssociation of Sri Lanka (ASASL),9-10 January, 2009 (1-26 pp), ISBN 978-955-0056-00-2Peiris, T. S. G. & Gunaratne, L. H. P. (2008). Abstracts of the National Statistics Conference organized by the Applied Statistics Association of Sri Lanka (ASASL), 7 January, 1-14.
Peiris, T. S. G.& Ranasinghe, C. S. (2004). Preceding I (Reviews & Invited Papers) of the International Conference of the CRISL: Tree of Life – New Trends in the Millennium 1-281 pp. ISBN: 955-9013-03-3.
Peiris, T. S. G. & Ranasinghe, C. S. (2004). Abstracts of International Conference of CRISL 1-85.
Peiris, T. S. G.& Ranasinghe, C. S. (2005). Proceeding II (Contributed Papers) of the International Conference of the CRISL: Tree of Life - New Trends in the Millennium(1-361 pp). ISBN: 955-9013-03-3.
Books
Chapters in a Handbook as a Supplementary Reading:
Peiris, T. S. G.(1999). Chapter 8 - Database Management in Excel. Handbook on Survey Design and Analysis (Editor. R. O. Thattil), Chapter 8, 52-64 pp. Postgraduate Institute of Agriculture, University of Peradeniya.
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