Prof. M.R. Sooriyarachchi

Prof. M.R. Sooriyarachchi

Senior Professor

Department of Statistics
University of Colombo,
Colombo 03,
Sri Lanka.
Tel: +94 (0)11 2590111
Fax : +94 (0)11 2590111

Academic Qualifications:

  • Ph.D.(1994) in Applied Statistics- University of Reading, UK
  • M.Sc.(1989) in Biometry – University of Reading, UK
  • Post Graduate Diploma(1988) in Applied Statistics- University of Colombo, Sri Lanka
  • B.Sc.(1985)- University of Colombo, Sri Lanka

Research Interests:

  • Medical Statistics
  • Categorical Data Analysis
  • Advanced Modeling
  • Reliability Theory
  • Inference
  • Statistical Computing
  • Simulation

Current Teaching

  • Medical Statistics (3rd year Statistics Special) : from 2009/10, 2012 to date
  • Categorical Data Analysis (4th Year Statistics Special) : 2012 to date

Research and Professional Experience

  • Research Experience: 20 years
  • Professional Experience: 23 years

Honors and Awards

  • The Mr. and Mrs. V.W. Samaranayake memorial prize for the best Statistics student at the B.Sc. degree, 1985
  • Professor Mohan Munasinghe award for the best Computer project at the B.Sc. degree, 1985
  • Technical Cooperation Training Award sponsored by the Overseas Development Administration, U.K. 1988 for study towards an M.Sc.
  • University of Newcastle Postgraduate Research Scholarship, 1991 Note: I was awarded this scholarship but I did not accept it as I accepted an Open Commonwealth Scholarship for my Ph.D. at the University of Reading, U.K.
  • Award of a fellowship by COPEDEC for participation at COPEDEC III, in Mombasa, Kenya, 1991
  • Open (in open competition) Commonwealth postgraduate scholarship 1991, for study towards a Ph.D
  • Welcome Trust U.K. award for Post-doctoral research, 2001
  • Presidential Award for international research, 1999
  • University of Colombo award for excellence in research, 1999
  • Senior Research Fellow at the University of Reading, U.K. on the research project “Comparison of adaptive and group-sequential methods for Clinical Trials” funded by Swiss phamaceutical company, Novartis Pharma, 2002
  • Presidents Research Award, 2001
  • Visiting Research Fellow, MPS Research Unit, University of Reading,U.K. Position held from 1st October 2003 to 2007. This is awarded in recognition of contribution to research at MPS research unit.
  • University of Colombo award of felicitation for receiving a Presidential Award for Research in year 2001
  • International Society for Clinical Biostatistics Conference Scientist award for ISCB27, 2006
  • NSF Travel award, 2006
  • Team member of the paper that won the International Society for Clinical Biostatistics Conference Scientist award for ISCB28, 2007
  • International Society for Clinical Biostatistics Conference Scientist award for ISCB29, 2008
  • NSF Travel award, 2008
  • Commonwealth Fellowship of 6 months duration to UK , 2009/10
  • Presidential Award for Scientific Research for 2003
  • Presidential Award for Scientific Research for 2006
  • SUSRED award for supervision of successful M.Phil. student within stipulated time, 2012 awarded by the National Science Foundation of Sri Lanka
  • Award for 25 years service to the University of Colombo, awarded by the University of Colombo in 2013.
  • Presidential award for Scientific Research 2007 awarded in 2014.
  • Presidential award for Scientific Research 2008 awarded in 2014.
  • National Research Council merit award for research for 2010 (awarded in 2014)
  • Faculty of Science, University of Colombo Research award for 2013

 

Publications

    • Whitehead J, Whitehead A, Todd S, Bolland KM, Sooriyarachchi MR. Mid-trial design reviews for sequential clinical trials: Statistics in Medicine. 2001; 20:165-176.
    • Sooriyarachchi MR, Whitehead J, Bolland K, Whitehead A, Matsushita T. Incorporating data received after a sequential trial has stopped into the final analysis: implementation and comparison of methods, Biometrics. 2003; 59: 701-709.
    • Kelly P, Sooriyarachchi MR, Stallard N, Todd S. A practical comparison of group-sequential and adaptive designs: Journal of Biopharmaceutical Statistics. 2005; 15:719-738.
    • Sooriyarachchi MR, Whitehead J, Whitehead A, Bolland K. The sequential analysis of binary responses: a score test for the case of three time points Statistics in Medicine. 2005; 25:2196-2214.
    • Mohamad F, Sooriyarachchi MR, Senarathna L, Azhar S, Sheriff MHR, Buckley NA, et al. Compliance for single and multiple dose regimes of super activated charcoal: a prospective study of patients in a clinical trial. Clinical Toxicology. 2007; 45: 1-4.
    • Kuruppumullage P, Sooriyarachchi MR. Log linear models for ordinal multidimensional categorical data: The journal of the National Science Foundation of Sri Lanka. 2007; 35(1): 29-40.
    • Whitehead A, Sooriyarachchi MR, Whitehead J, Bolland K. Incorporating intermediate binary responses into interim analyses of clinical trials: a comparison of four methods. Statistics in Medicine. 2008; 27:1646-1666.
    • Abeysekera WWM, Sooriyarachchi MR. A novel method for testing goodness of fit of a proportional odds model: An application to an AIDS study: The journal of the National Science Foundation of Sri Lanka. 2008; 36(2) : 125-135.
    • Dharmarathne TMRT, Sooriyarachchi MR. Failure time regression to determine warranty policies of computers: Sri Lankan Journal of Applied Statistics. 2007; Vol. 8 (Special Issue), 19-33.
    • Kuruppumullage P, Sooriyarachchi MR. Design and analysis techniques for many-to-many matched case-control studies: An illustration using the Ille-et-Vilaine database for esophageal cancer: Sri Lankan Journal of Applied Statistics. 2007; Vol. 8 (Special Issue), 55-70.
    • Yatapana PS, Sooriyarachchi MR. University selection among students of different streams: A comparison of methods. The Sri Lankan Journal of Educational Research. 2006; Volume 10, Issue 1:1-22.
    • Abeysekera WWM, Sooriyarachchi MR. Use of Schoenfeld’s global test to test the proportional hazards assumption in the Cox proportional hazards model: An application to a clinical study: The Journal of the National Science Foundation of Sri Lanka. Volume 37, Issue 1:41-51.
    • Perera HLC, Sooriyarachchi MR, Fitting correlation adjusted generalized linear models to clustered dengue data measured over time: Sri Lankan Journal of Applied Statistics. 2008; Vol. 9 (Special Issue): 159-175.
    • Jayawardana NKPS, Sooriyarachchi MR, Prognostic models with competing risks: Methods and Application to Prostate Cancer data: Sri Lankan Journal of Applied Statistics. 2009; Volume 10: 43-64.
    • Nadarajah K, Sooriyarachchi MR. A monte-carlo Simulation study of the properties of Residual Maximum Likelihood (REML) estimators for the linear Gaussian mixed model: Sri Lankan Journal of Applied Statistics. 2009; Volume 10: 119-136.
    • Sunethra AA, Sooriyarachchi MR, Variance-Corrected proportional Harzards models for the analysis of multiple failures in personal computers: Quality and Reliability Engineering International. 2011; 27: 85-97.
    • Viswakula SD, Sooriyarachchi MR. Diagnostics for matched case control studies: SAS macro for Proc Logistic: Journal of National Science Foundation of Sri Lanka. 2011; 39(1): 13-23.
    • Siyasinghe N, Sooriyarachchi MR. Guidelines for calculating sample size in 2×2 Crossover Trials: A simulation study: Journal of National Science Foundation of Sri Lanka. 2011; 39(1): 77-89.
    • Sooriyarachchi MR, Jayatillake RV, Ranganath H, Eddleston M. The use of mid-trial reviews for design modifications in small scale Clinical Trials: Contemporary Clinical Trials. 2010; 31(6): 579-586.
    • Jayatillake RV, Sooriyarachchi MR, Senarathna, DLP. Adjusting for a cluster effect in the Logistic Regression Model: An illustration of theory and its application: Journal of the National Science Association of Sri Lanka.
    • Sooriyarachchi MR. Incorporating data received after a sequential trial has stopped into the final analysis: A comparison of methods: Proceedings of the 23rd meeting of the International Society for Clinical Biostatistics (ISCB); 2002; Dijon, France.
    • Withanage DAD, Sooriyarachchi MR. A study on influence of factors effecting Educational achievement of students in Colombo: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2003; Sri Lanka.
    • Kottachchi D, Sooriyarachchi MR. An analysis of standard of degrees awarded by Sri Lankan universities: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2003; Sri Lanka.
    • Sooriyarachchi MR, Wedage DM. The Re-Housing Programme – Different views and factors that influence it: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2003; Sri Lanka.
    • Balachandran L, Sooriyarachchi MR. Study of oral cavity cancer: Proceedings of the joint annual sessions, Faculties of Medicine and Science, University of Colombo; 2004.
    • Sooriyarachchi MR, Whitehead J. Comparing survival curves with non-proportional hazards: An application in sequential clinical trials: Proceedings of the International Sri Lankan Statistical conference: Visions of Futuristic Methodologies; 2004; 467-477.
    • Whitehead A, Sooriyarachchi MR, Whitehead J, Bolland K. Use of intermediate outcomes to reduce trial duration in sequential designs in stroke: Proceedings of the 26th meeting of the International Society for Clinical Biostatistics(ISCB); 2005; Hungary.
    • Sooriyarachchi MR, Jayathillake R, Ranganath H, Eddleston M. Use of an internal pilot study in testing hypotheses pertaining to a Gaussian error linear model: An application to a clinical toxicology study: Proceedings of the 27th meeting of the International Society for Clinical Biostatistics (ISCB); 2006; Geneva, Switzerland.
    • Simmonds M, Sooriyarachchi MR, Whitehead J. Sequential analysis of repeated binary responses using weighted logistic regression: Proceedings of the 27thmeeting of the International Society for Clinical Biostatistics (ISCB); 2006; Geneva, Switzerland.
    • Jayasundera DRT, Sooriyarachchi MR. A study on factors affecting the formation of cataract: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2006; Sri Lanka.
    • Jayathillake R, Sooriyarachchi MR. Factors affecting the prevalence of lung cancer and the survival of lung cancer patients: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2006; Sri Lanka.
    • Jayathillake R, Sooriyarachchi MR, Senerathna L. Logistic Regression Model with Cluster Effect: An application in a cross-sectional study in management of poisoned patients in Sri Lanka: Proceedings of the 28th meeting of the International Society for Clinical Biostatistics (ISCB); 2007; Alexanderpoulis Greece.
    • Yatapana PS, Sooriyarachchi MR. Proposal for a Student Selection Method for University admissions in Sri Lanka: Sri Lankan Association for the Advancement of Science (SLAAS); 2007.
    • Abeysekera W. Sooriyarachchi MR. A study of the factors effecting knowledge and practices of HIV AIDS among up-country estate plantation workers: Sri Lankan Association for the Advancement of Science (SLAAS); 2007.
    • Sooriyarachchi MR, Kurupumullage P. Analysis of a clinical trial with single and multiple dose treatments: Proceedings of the 29th meeting of the International Society for Clinical Biostatistics (ISCB); 2008; Copenhaegen, Denmark.
    • Perera L, Sooriyarachchi MR. An Epidemiological Study of Dengue Fever: Proceedings of the annual sessions of the University of Colombo; 2008.
    • Lakraj GP, Sooriyarachchi MR. A nutritional study of school children: Proceedings of the annual sessions of the University of Colombo; 2008.
    • Yatapana PS, Sooriyarachchi MR. Descriptive Evaluation of the Common Currency Index Method: A new Selection Method for University Admission in Sri Lanka: Proceedings of the annual sessions of the University of Colombo, 2010.
    • Pathirathne L., Sooriyarachchi MR. A study of Life Expectancy for countries of the United Nations: Proceedings of the Sri Lankan Association for the Advancement of Science (SLAAS); 2010.
    • Madubhani HAPP, Sooriyarachchi MR. An Epidemiological Study of Viral Hepatitis in Sri Lanka: Proceedings of the annual sessions of the Sri Lankan Association for the Advancement of Science (SLAAS); 2010.
    • Ranaweera D, Sooriyarachchi MR. Modeling Predominant Breast Feeding and Time to Stopping Breast Feeding: Proceedings of the Jaffna Research symposium; 2010 November.
    • Madhubani P, Sooriyarachchi MR. Epidemiological Modeling of Viral Hepatitis in Sri Lanka: Proceedings of the Jaffna Research symposium; 2010 November.
    • De Silva, D.B.U.S. Sooriyarachchi, M.R. Generalized Linear Multilevel Models for Ordinal Categorical Responses: Methods and Application to Medical Data. Sri Lankan Journal of Applied Statistics 2011 Volume 12; 83-99.
    • Goonaratna, C., Sooriyarachchi, M.R. The effect of a herbal formulation on the incidence and severity of upper respiratory symptoms in healthy volunteers : an open-label, randomized controlled clinical trial. Ceylon Medical Journal (2012) 57:19-32
    • De Silva, D.B.U.S. Sooriyarachchi, M.R. Generalized Cochran Mantel Haenszel Test for Multilevel Correlated Categorical Data: An Algorithm and R Function. Journal of the National Science Foundation, Sri Lanka, 2012 40(2):45-56
    • Senaratna, D. M. and. Sooriyarachchi, M.R., Determining the Sensitivity and Specificity of a Substitute Test as a Diagnostic for its Gold Standard in the presence of Severe Missingness. Journal of the National Science Foundation, Sri Lanka, 2012 40(4) 321-331.
    • Amerasinghe, N., Sunethra, A.A., Sooriyarachchi, M.R. (2013) Variance Corrected Proportional Hazard Model for the Analysis of Recurrent Multiple Failure Modes. Jurnal Teknologie 63(2) published online doi: 10.11113/jt.v63.1914
    • Jayasekera, D., Sooriyarachchi, M.R. (2013) A simulation based study for comparing tests associated with Receiver Operating Characteristic (ROC) curves. Communications in Statistics (Simulation and Computation). published online. DOI:10.1080/03610918.2012.752840
    • Jayawardene, N.I. and Sooriyarachchi, M.R. A multilevel Bayesian analysis of university entrance eligibility for selected districts in Sri Lanka: Methods and Application to educational data. Accepted by, the Journal of the National Science Foundation of Sri Lanka.
    • Perara, P, Sooriyarachchi, M.R. and Wickremasuriya, S. A Goodness of fit test for the Multilevel logistic model. Communications in Statistics (Simulation and Computation). Accepted.
    • Wickremasuriya, S. and Sooriyarachchi, M.R. A Multilevel Analysis to Determine the Impact of Demographic, Clinical and Climatological Factors on Type of Dengue. Accepted by the International Journal of Biological Sciences and Engineering (IJBE), India
    • Peshala Madhubani and Sooriyarachchi, M.R. Model to Identify the Affect of Water Quality Parameters on Incidence of Hepatitis. Accepted by the International Journal of Earth Science and Engineering (IJEE), India
    • Jayasekera D, Sooriyarachchi MR (2013) A simulation based study for comparing tests associated with Receiver Operating Characteristic (ROC) curves. Communications in Statistics (Simulation and Computation). published online. DOI:10.1080/03610918.2012.752840
    • Jayawardene NI and Sooriyarachchi MR. A multilevel Bayesian analysis of university entrance eligibility for selected districts in Sri Lanka: Methods and Application to educational data. Accepted by, the Journal of the National Science Foundation of Sri Lanka.
    • Perera P, Sooriyarachchi MR and Wickremasuriya SA. Goodness of fit test for the Multilevel logistic model. Accepted for publication in Communications in Statistics (Simulation and Computation).
    • Wickremasuriya S and Sooriyarachchi MR. A Multilevel Analysis to Determine the Impact of Demographic, Clinical and Climatological Factors on Type of Dengue. Accepted by the International Journal of Biological Sciences and Engineering (IJBE)
    • Peshala Madhubani and Sooriyarachchi MR. Model to Identify the Effect of Water Quality Parameters on Incidence of Hepatitis. Accepted by the International Journal of Earth Science and Engineering (IJEE)

Research papers/abstracts presented and published in academic symposium, professional bodies at international level

    • De Silva, D.B.U.S. Sooriyarachchi, M.R. Generalized Linear Multilevel Models for Ordinal Categorical Responses: Methods and Application to Medical Data. Presented at the international conference in Statistics, Colombo, Sri Lanka, 2011.
    • Dayaratne, A. and Sooriyarachchi, M.R. The affect of breeding place on the filarial infection rate of larvae. Proceedings of the International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013
    • Wickremasuriya, S., Sooriyarachchi, M.R., Effect of Rainfall and their lags on different types of dengue infection when adjusted for other factors. Proceedings of the International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013
    • Madhubani, P. and Sooriyarachchi, M.R. Model to identify the affect of water quality parameters on incidence of viral hepatitis. International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013

Research papers/abstracts presented and published in academic symposium, professional bodies at national level

    • Deepawansa, M.D.D.D., Sooriyarachchi, M.R.,Wickremasinghe, W.N.W. Determinents of Poverty in Sri Lanka, Proceedings of the University of Colombo research symposium 2011
    • Peiris, T.D.R., Sooriyarachchi, M.R., A Study of prognostic factors for Breast Cancer, Proceedings of the University of Colombo research symposium 2012
    • Sunethra, A.A. and Sooriyarachchi, M.R. Estimating Reliability and predicting warranty of an electronic device with multiple failure modes. Proceedings of the SAITM Research Symposium on Engineering Advancements 2013.
    • Karunaratne, K.M.D.S.D., Sooriyarachchi, M.R. Factors Associated with the Fertility of Sri Lankan Women, Proceedings of the University of Colombo research symposium 2013
    • Senevirathne, A. Sooriyarachchi, M.R. Characteristics and Determinants of Informal Employment in Sri Lanka. Proceedings of the University of Colombo research symposium 2013
    • Dayaratne A and Sooriyarachchi MR. The effect of breeding place on the filarial infection rate of larvae. Proceedings of the International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013 (abstract only)
    • Wickremasuriya, S., Sooriyarachchi, M.R., Effect of Rainfall and their lags on different types of dengue infection when adjusted for other factors. Proceedings of the International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013 (abstract only)
    • Madhubani, P. and Sooriyarachchi, M.R. Model to identify the effect of water quality parameters on incidence of viral hepatitis. International Symposium on “WATER QUALITY AND HUMAN HEALTH: CHALLENGES AHEAD” , 2013 (abstract only)
    • Sunethra, A.A. and Sooriyarachchi, M.R. (2013) Estimating Reliability and predicting warranty of an electronic device with multiple failure modes. Proceedings of the SAITM Research Symposium on Engineering Advancements.
    • Karunarathne, S. and Sooriyarachchi, M.R. Factors Associated with the fertility of Sri Lankan women, Annual Research Symposium, 2013 Faculty of Science, University of Colombo (abstract only)
    • Senevirathne, A. and Sooriyarachchi, M.R. Characteristics and Determinants of Informal Employment in Sri Lanka, Annual Research Symposium, 2013 Faculty of Science, University of Colombo (abstract only)
    • Meyen, N. and Sooriyarachchi, M.R. Simulation study of a novel method for comparing more than two independent Receiver Operating Characteristic (ROC) curves. Proceedings of the academic sessions of the Insitute of Applied Statistics, 2013. (abstract only)
    • Kottage, H., De Silva D.B.U.S. , Sooriyarachchi, M.R. and Senerathna, D. Missing Value imputation for multilevel categorical data. Proceedings of the academic sessions of the Insitute of Applied Statistics, 2013 (abstract only).

Other research publications (monographs, books etc.) by reputed publishers

    • Monograph titled “Design and Analysis of Clinical Studies”Published by the Institute of Applied Statistics Sri Lanka, 2013

Books/ Chapters:

    • Sooriyarachchi M.R. and Lea N. ‘Estimating probable rainfall for irrigation scheduling in the tropics’ Technical Report OD/TN 49 Hydraulics Research Wallingford, U.K. , August 1990. Results of this report were used in irrigation models in Sri Lanka (Hakwatuna Oya) and Thailand (Kaiesaro).
    • Co-author, A Statistics book titled, ‘Moolika Sankyanaya (Basic Statistics)’ for the General Certificate Examination (Advanced level) and University first year students, 1996.
    • Sri Lanka’s contributor to ‘Encyclopedia of Statistical Sciences’ published by Springer-Verlag, 2011 and Edited by Prof. Miodag Lovric.

 

Research Supervision

Special Degree Undergraduate Level Projects Have supervised over 35 research projects in all. In the past 5 years, these projects have resulted in 7 full papers in International journals, 5 full papers in local journals, 2 full papers in proceedings of conferences, 3 abstracts at International conferences and 9 abstracts at National conferences. This has resulted in 3 students winning the SLAAS best project award at a National level and I Myself winning two Conference Scientist awards and a student wining a Conference Scientist award at International level.

Memberships
    • Member of the Institute of Applied Statistics, Sri Lanka.
    • Member of International Society for Clinical Biostatistics

 

Other

    • Collaborative Research with Hydraulics Research, Wallingford, U.K., 1989
    • Advisor, South Asian Clinical Toxicology Collaboration, 2006-2007
    • Visiting Research Fellow, University of Reading, UK, from 2005-2007 (3 Years)
    • Advisor, Link Herbal Products (Pvt.) Ltd. 2010 todate
    • Chairperson of the Research and Development Committee of the Institute of Applied Statistics, Sri Lanka
    • Supervising 3 higher degree research students

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