Prof. Leslie Jayasekara


B.Sc. in Mathematics (Kelaniya, Sri Lanka),

M.Sc. in Information Systems (Kyushu, Japan),

Ph.D. in Mathematics (Kyushu, Japan)


Present Position: Professor in Mathematics

Phone: +94(041) 2227018, Ext : 4203


Email: leslie@maths.ruh.ac.lk





Research Interests:



Categorical Data Analysis, Meta-Analysis, Statistical Methods for Quality improvement, R programming



Teaching :

  1. Introductory Statistics

  2. Mathematical Statistics I (Fundamentals for Multivariate Statistics)

  3. Mathematical Statistics II (Statistical Inference)

  4. Bayesian Inference and Decision Theory

  5. Statistical Laboratory (Using R Language)

  6. Categorical Data Analysis

  7. Statistics with Computer Applications

  8. Regression Analysis

  9. Bio-Statistics



Publications :



Research Publications in Refereed Journals:


  1. Leslie Jayasekara, Takashi Yanagawa and Masaaki Tsujitani (1994)

A Location-Dispersion Test for 2 x k Tables

Bulletin of Informatics and Cybernetics, Vol. 26, No 1-2.


  1. Takashi Doi, Toshiie Sakata, Hironobu Yoshimatsu, Hironobu Machdori, Mamoru Kurokawa, L. A. L. W. Jayasekara, Naoto Niki (1994)

Hypothalamic neuronal histamine regulates feeding circadian rhythm in rats

BRAIN RESEARCH 641 311-318.

  1. Leslie Jayasekara and Takashi Yanagawa (1995)

Testing Ordered Categorical Data in 2 x k Tables by the Statistics with Orthonormal Score Vectors

Bulletin of Informatics and Cybernetics, Vol. 27, No 1.

  1. Leslie Jayasekara, Harutoshi Nishiyama and Takashi Yanagawa (1999)

Versatile Test for Non-Linear Ordinal Data in 2 x k Tables

Bulletin of Informatics and Cybernetics, Vol. 31, No 2, 179-190

  1. Leslie Jayasekara and Takashi Yanagawa (2007)

Testing Non-Linear Responses in L 2 x k Tables

Ruhuna Journal of Science, (2007), Vol 2, 18-29, Faculty of Science, University of Ruhuna.


Presentations at conferences, meetings of professional associations:


  1. Testing Ordered Categorical Data in 2 x k Tables by the Statistics with Orthonormal Score Vectors,

Kitagawa Symposium on Informatics and Cybernetics,

Research Association of Statistical Science.

Date: May 26-27, 1994

Venue: Kyushu University, Fukuoka, Japan.


  1. Testing Ordered Categorical Data in 2 x k Tables by the Statistics with Orthonormal Score Vectors,

Symposium on Bio-Statistics.

Date: November 24, 1994

Venue: Yokohama, Japan.


  1. Testing Ordered Categorical Data in 2 x k tables for non-linear response,

Japan Mathematical Society.

Date: March 1995


  1. Versatile test for ordinal data in 2 x k tables,

Symposium on Bio-Statistics, ,

Date: December 14, 1995

Venue: Oita, Japan.


  1. Versatile test for ordinal data in 2 x k tables,

Japan mathematical Society-Kyushu, ,

Date: February 17, 1996

Venue: Ropponmatsu Campus, Kyushu University, Fukuoka, Japan.


  1. Extending the Qt test for non-linear response to L 2 x k tables,

Date: October 17-19, 1996

Venue: Faculty of Engineering, Kumamoto University, Kumamoto, Japan


  1. A Location-Dispersion Test for Ordered Categorical Data in r x k Tables

Sri Lanka Association for the Advancement of Science (SLAAS)

Date: 27 November – 01 December 2000

Venue: 56th Annual Session 2000


  1. Birth, Death and Catastrophe Process

Sri Lanka Association for the Advancement of Science (SLAAS)

Date: 27 November – 01 December 2000

Venue: 56th Annual Session 2000


  1. Birth, Death and Catastrophe Process

Sri Lanka Association for the Advancement of Science (SLAAS)

Date: 27 November – 01 December 2000

Venue: 56th Annual Session 2000


  1. Reporting Bias in Systematic Reviews: A Bayesian Meta-analysis of 50 Years of Ruptured Abdominal Aortic Aneurysm Repair,

Young Researcher’s Meeting.

Date: University of Warwick, United Kingdom,

Venue: University of Warwick, United Kingdom,


  1. Location-Dispersion Test for Ordered Categorical Data,

Young Statisticians Meeting 2006.

Date: April 19th-20th 2006

Venue: University of Edinburgh, United Kingdom


  1. Modeling the outcome reporting bias in meta-analysis

Meta-analysis workshop, Royal Statistical Society.

Date: 19th June 2006

Venue: Royal Statistical Society, United Kingdom.


  1. Reporting Bias in Systematic Reviews: A Bayesian Meta-analysis of 50 Years of Ruptured Abdominal Aortic Aneurysm Repair.,

23rd International Biometric Conference.

Date: July 16-21, 2006

Venue: Montreal, Quebec, Canada.


  1. Modeling the outcome reporting bias in meta-analysis

The International Conference of the Royal Statistical Society

Date: 10-14 September 2006.

Venue: Queen’s University, Belfats, United Kingdom.


  1. Studying of validation of fractional factorial designs and Taguchi Method using toilet base soap in local industry,

Second Science Symposium,

Date: 11 August 2004.

Venue: Faculty of Science,

University of Ruhuna.


  1. Survey Study of The Requirement of A Teller Machine Within The Ruhuna University Wellamadama Premises For The Public Usage, Fifth Science Symposium,

Date: 11 February 2009

Venue: Prof. Alawatthagoda Pemadasa Auditorium

Faculty of Science, University of Ruhuna


  1. Survey about facilities obtained for students by the University of Ruhuna & related facts for the results of students in the faculty of Science.

Fifth Science Symposium,

Date: 11 February 2009

Venue: Prof. Alawatthagoda Pemadasa Auditorium

Faculty of Science, University of Ruhuna


  1. Modelling the outcome reporting bias within a study in meta-analysis

    Date: 15 October 2009

    Venue: Biostatistics Center, Kurume University, Kurume, Japan.