Dr Rasiah Thayakaran BSc, MSc, PhD

Rasiah Thayakaran

Institute of Applied Health Research
Research Fellow in Health Informatics (Statistics)

Contact details

IOEM Building
University of Birmingham
B15 2TT

Thayakaran (Thaya) is a Research Fellow in Health Informatics (Statistics) in the Institute of Applied Health Research, University of Birmingham.

His research focuses on propensity score matching for observational data and on survival analysis using extended Cox proportional hazard model with time varying covariates. Also his research interests have focused recently on methods for dealing with missing data using single/multiple imputation.


  • PhD in Statistics from the University of Greenwich in 2014
  • MSc in Biometry from the University of Reading in 2010
  • BSc in Statistics from the University of Jaffna in 2002.


Dr RasiahThayakaran (Thaya) is Research Fellow in Health Informatics (Statistics) in the Institute of Applied Health Research, University of Birmingham. 

Previously, Thaya was an Instructor in the Department of Mathematics and Statistics, University of Jaffna, Sri Lanka (from 2002 to 2006). He was a part time Lecturer in the Department of Mathematical Sciences, University of Greenwich (from September 2011 to June 2014). Thaya was a Research Associate in the School of Mathematics, Statistics and Physics, Newcastle University (from July 2014 to March 2016). He was a Lecturer in Health Statistics in the Lancashire Clinical Trials Unit, University of Central Lancashire (from April 2016 to June 2017).


Thaya’s research interests are primarily in the area of statistics with particular focuses on stochastic models of rainfall, statistics for applied health research and community detection using graphs with a focus on social media applications.

Research groups and centres

Institute of Applied Health Research 


Chandan, Joht Singh, Dawit Tefra Zemedikun, Rasiah Thayakaran, Nathan Byne, Samir Dhalla, Dionisio Acosta‐Mena, Krishna M. Gokhale et al. "Non‐steroidal anti‐inflammatory drugs and susceptibility to COVID‐19." Arthritis & Rheumatology (2020).

Goel, R., Chandan, J. S., Thayakaran, R., Adderley, N. J., Nirantharakumar, K., & Harper, L.Cardiovascular and renal morbidity in Takayasu arteritis: a population‐based retrospective cohort study from UK. Arthritis & Rheumatology (2020).

King, Dominic, Raoul C. Reulen, Tom Thomas, Joht Singh Chandan, Rasiah Thayakaran, Anuradhaa Subramanian, Krishna Gokhale et al. "Changing patterns in the epidemiology and outcomes of inflammatory bowel disease in the United Kingdom: 2000‐2018." Alimentary Pharmacology & Therapeutics 51, no. 10 (2020): 922-934.

Almulhem, Munerah, Radhika Susarla, Luluh Alabdulaali, Kamlesh Khunti, Muhammad Ali Karamat, Thayakaran Rasiah, Abd A. Tahrani, Wasim Hanif, and Krishnarajah Nirantharakumar."The effect of Ramadan fasting on cardiovascular events and risk factors in patients with type 2 diabetes: A systematic review." diabetes research and clinical practice 159 (2020): 107918.

Šumilo, Dana, Krishnarajah Nirantharakumar, Brian H. Willis, Gavin Rudge, James Martin, Krishna Gokhale, Rasiah Thayakaran et al. "Long-term impact of giving antibiotics before skin incision versus after cord clamping on children born by caesarean section: protocol for a longitudinal study based on UK electronic health records." BMJ open 9, no. 9 (2019): e033013.

Crowe, Francesca L., Rasiah Thayakaran, Neil Gittoes, Martin Hewison, G. Neil Thomas, Robert Scragg, and Krishnarajah Nirantharakumar. "Non-linear associations of 25-hydroxyvitamin D concentrations with risk of cardiovascular disease and all-cause mortality: results from the Health Improvement Network (THIN) database." The Journal of steroid biochemistry and molecular biology 195 (2019): 105480.

Ntouva, Antiopi, Konstantinos A. Toulis, Deepiksana Keerthy, Nicola J. Adderley, Wasim Hanif, Rasiah Thayakaran, Krishna Gokhale et al. "Hypoglycaemia is associated with increased risk of fractures in patients with type 2 diabetes mellitus: a cohort study."  European journal of endocrinology 180.1 (2019): 51-58.

Rasiah Thayakaran, Mary Perrins, Krishna Gokhale, Kumaran Subaschandren, Parth Narendran, Malcolm J Price, Krishnarajah Nirantharakumar and Toulis “Impact  of  Glycaemic  Control  on  Fracture  Risk  in  5,368  patients with  Type  1  Diabetes:  a  time-dependent  analysis.” Diabetic Medicine 36.8 (2019): 1013-1019.

Rasiah Thayakaran, Nicola J Adderley, Christopher Sainsbury, Dana Sumilo, Malcolm J Price, G Neil Thomas, Toulis Konstantinos and Krishnarajah Nirantharakumar. “Thyroid replacement therapy, thyroid stimulating hormone levels and long-term health outcomes in patients with hypothyroidism: a longitudinal study” bmj 366 (2019): l4892. 

Tom Taverner, Francesca L Crowe, Neil Thomas, Krishna Gokhale, Rasiah Thayakaran, Krishnarajah Nirantharakumar and Yusuf A Rajabally. “Circulating folate concentrations and risk of peripheral neuropathy: a retrospective cohort study” Nutrients 11(10), (2019): 2443.

Toulis, Konstantinos A., John P. Bilezikian, G. Neil Thomas, Wasim Hanif, Kalliopi Kotsa, Rasiah Thayakaran, Deepiksana Keerthy, Abd A. Tahrani, and Krishnarajah Nirantharakumar. "Initiation of dapagliflozin and treatment‐emergent fractures." Diabetes, Obesity and Metabolism 20.4 (2018): 1070-1074

Thayakaran R, Ramesh NI. "Doubly stochastic Poisson pulse model for fine-scale rainfall." Stochastic Environmental Research and Risk Assessment (2016): 1-20

Thayakaran R, Ramesh NI. 2012, "Multivariate models for rainfall based on Markov modulated Poisson processes", Hydrology Research In Press, doi:10.2166/nh.2012.180.

Ramesh NI , Thayakaran R,Onof C. 2012, "Multi-site doubly stochastic Poisson process models for fine-scale rainfall" Stochastic Environmental Research and Risk Assessment (2012): 1-14.

Thayakaran R, Ramesh NI.  2013, "Markov modulated Poisson process models incorporating covariates for rainfall intensity", Water Science & Technology 67.8 (2013): 1786-1792.

Thayakaran R, Ramesh NI. 2012, "The Markov Modulated Poisson Process Models for Rainfall with Covariate Information", 13th International Conference on Econometrics, Operations Research and Statistics, ICEOS-2012, Famagusta – Northern Cyprus.

Ramesh NI, Thayakaran R. 2012, "Stochastic point process model for fine-scale rainfall time series", Proceedings, 2nd Stochastic Modeling Techniques and Data Analysis International Conference 5 - 8 June 2012 Chania Crete Greece.


A simple pulse model for fine scale rainfall based on a two state Markov Modulated Poisson Process at the Young Statisticians' Meeting (YSM2013, 4 -5, July, 2013), Imperial College, London, UK

The Markov Modulated Poisson Process Models for Rainfall with Covariate Information at the 13th International conference on Econometrics, Operations Research and Statistics (24 – 26, May, 2012), Northern Cyprus.

A Multivariate Markov Modulated Poisson Process for Rainfall intensity at the International Conference (Applied Statistics, 25 -28, September, 2011), Slovenia.

Social Network Analysis for Geo-located Social Media Data at the Young Statisticians' Meeting (YSM2016, 17 -19, August, 2016), University College London (UCL), UK