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Paul Hewson Paul Hewson
Qualifications & background 2005: University of Exeter, PhD in Statistics 1998: Sheffield Hallam University, MSc in Applied Statistics 1988: Plymouth Polytechnic, BSc (hons) First Class in Biological Sciences Professional membership
Roles on external bodies Member of advisory group for Department for Transport Project "Road Safety Research Dissemination and Action Learning", October 2007 onwards Member of RSS Statistical Computing Section Committee 2005 - Member of RSS Official Statistics Section Committee 2001 - 2005: Organised RSS Meetings: "Assuring Quality of Performance Indicators" 25th April 2002, "Measuring Congestion" October 2002 (joint meeting with Transport Statistics User Group), "Monitoring the Impact of the London Congestion Charge", 29th January 2004, "Road Safety and Speed Cameras" 10th November 2004 (RSS website) Teaching interests UoP and PMS Modules STAT2402 (Regression Modelling) STAT3403 (Computational Statistics) EOE3217 (Climate Changes and Impacts - statistical modelling ENVS106 (Environmental Data Handling) SSU (Performance Indicators in the Health Service) PgCAP 700: Teaching Statistical Literacy RSS Certificate Course: Teaching Statistics in HE Other Teaching December 2009 "Bayesian Statistics" African Intsitute of Mathematical Sciences September 2012, 2011, 2010, 2009, 2008, 2007 "Probability Crash Course", LMEC Universita degli Studi di Bologna, Facolta di Economia; 25th to 27th October 2005, Short Course "Modelling Count Data", Universita degli Studi di Bologna, Facolta di Economia 24th July 2006 "Multivariate data and modelling", BCS International Summer School in Pattern Recognition 17th to 21st July 2006, July 2007, October 2007, April 2008, September 2008: Short Course "Evidence Based Practice in Road Casualty Reduction,", University of Plymouth 25th October 2007, Introduction to Multilevel Modelling with R, University of Plymouth 6th December 2007, Package building in R, Institute of Child Health, University College London University of Plymouth Teaching Fellowship 2006-2007: P.J.Hewson and G.C. Crocker "Integrating assessment software with plausible simulation to provide a visual guided learning framework for research design" Research interests I am interested in generalised linear mixed models (GLMM), particulary for multivariate responses. These models could be considered as a vector of GLMs with the the assumption that there is an underlying multivariate normal random effect. There are a number of ways of approaching these models, I have tended to focus on Bayesian approaches, and have tended to use MCMC. There seem to be two routes to the multivariate normal distribution, one involves a Wishart prior for the multivariate random effects the alternative is to envisage a latent structure with a smaller number of latent variables and a matrix of loading variables which effect a transformation of the latent variables into the higher dimensionality of the response variables. Most of my recent effort has gone into these latent structure models with a view to superimposing a discrete mixing structure, in particular this seems to yield a good method for unsupervised classfication of multivariate count data. However, there seem to be many possibilities to use latent variables with application specific structures, such as having Conditionally Autoregressive Priors, or temporally correlated sets of latent variables or even to allow for spatial structuring. To date, I have applied these models to a variety of problems which has included the analysis of performance indicators as well as casualty data arising from road collisions. Most effort at the moment goes into using them in rather large small area estimation problems. However, the exciting thing about these models is the potential to handle a very wide range of multivariate data and they could be a valuable approach in many problem areas. Here
is an attempt to start visualising two univariate random effects
models fitted to "STATs 19" motorcycle casualty data for 2000.
Grants & contracts Publications Papers in mainstream statistical journals
T.C. Bailey and P.J. Hewson (2004), "Simultaneous modelling of multiple traffic safety performance indicators using a multivariate generalised linear mixed model", Journal of the Royal Statistical Society Series A, 167(3): 501-517 (journal website) P.J.Hewson and K.Yu (2008) "Quantile regression for binary performance indicators" Applied Stochastic Models in Business and Industry 24(5): 401-418 (Journal Website) P.J. Hewson and T.C. Bailey (2010): Modelling multivariate disease rates
with a latent structure mixture model, Statistical Modelling 10(3): 241–264 P.J.Hewson (2011) "ANALYSIS OF HEAD INJURIES USING A BAYESIAN VECTOR GENERALIZED ADDITIVE MODEL" Australian and New Zealand Journal of Statistics 53: 233–246 Applied papers Ray B Jones, Paul Hewson and Edward R Kaminski (2010) Referrals to a regional allergy
clinic - an eleven year audit BMC Public Health 10:790. http://www.biomedcentral.com/1471-2458/10/790
J Thompson Coon, G Rogers, P Hewson, D Wright, R Anderson, S Jackson, S Ryder, M Cramp, K Stein (2008) "Surveillance of cirrhosis for hepatocellular carcinoma: a cost‑utility analysis" British Journal of Cancer 98(7):1166-75 (journal website) P.J.Hewson (2007) "Quantile Regression provides a fuller analysis of Speed Data". Accident Analysis and Prevention 40(2) 502-510 (Link to journal website)
P.J. Hewson (2005), "Investigating population level trends in head injuries amongst child cyclists in the UK", Accident Analysis and Prevention, 37 (5): 807-815 (journal website) Description of this work in the Guardian P.J. Hewson (2005), "Epidemiology of child pedestrian casualty rates: Can we assume spatial independence", Accident Analysis and Prevention, 37(4): 651-659 (journal website) P.J.Hewson (2005), "Cycle helmets and road casualties in the UK",Traffic Injury Prevention 6(2): 127 - 134 P.J. Hewson (2004), "Deprived Children or Deprived Neighbourhoods? A public health approach to the investigation of links between deprivation and injury risk with specific reference to child road safety in Devon County, UK", BMC Public Health 4:15 (journal website) N. Manghat, Robin Van Lingen, Paul Hewson, Farhan Syed, Nirmal Kakani, Ian Cox, Carl Roobottom, Gareth Morgan-Hughes (2008) "Usefulness of 64-Detector Row Computed Tomography for Evaluation of Intracoronary Stents in Symptomatic Patients WIth Suspected In-Stent Restenosis" American Journal of Cardiology 101(11):1567-73 (journal website) A.W. Bühler, T.W. Heffernan and P.J. Hewson (2006) "The Soccer Club - Sponsor Relationship: Identifying the Critical Variables for Success", International Journal of Sports Marketing and Sponsorship, 8(4) (Forthcoming) K. Jethwa, N. Galappathie and P. Hewson (2007) "The effects of a crisis resolution and home based treatment team upon inpatient admissions: A service evaluation report" Psychiatric Bulletin 31:170-172 (journal website) Conference presentations
P.J.Hewson and K.Yu (2006), "Quantile regression for binary performance indicators", Statistical Methods in the analysis of Performance Indicators (SMAP2006), Cassino, Italy, April 2006
P.J.Hewson (2005), "The use of bivariate generalised additive models to investigate the effectiveness of cycle helmets" presented at International Biometic Society Multi-Regional Conference, Leicester, April 2005
P. Hewson and T.C. Bailey (2003), "Use of repeated measures in performance indicator modelling", poster presented at RSS meeting on Performance Surveillance and Modelling January 2003
P.Hewson and T.C.Bailey (2002), "Use of multivariate Generalised Linear Mixed Models (GLMMs) for simultaneous investigation of multiple performance indicators", presented at RSS International Conference, Plymouth, September 2002
T. Ashton, P.Hewson, R.Maini (1995),"Platelet thrombogenic response to polyester can be passivated by fluoropolymer surface treatment", poster presented at the 12th European Society of Biomaterials Conference, Porto 1995
I.Sommer, P.Hewson, P.G.E. Kennedy (1990), "HSV-1 Infection of Optic Nerve Cells in vitro", poster presented at the VIIIth International Congress of Virology, Berlin 1990 Reports & invited lectures Invited Presentations J.P.Phillips and P.J.Hewson (2008) "Evidence based practice: origins, beacon legacy and KTP" Institute of Highways Incorporated Engineers South West Meeting February 2008 P.J.Hewson (2008) "Evidence Based Practice" Urban Design Group, London, January 2008 P.J.Hewson (2007) "R-books - integrating R into an e-book" UseR! 2007 Conference, Iowa State University Presentation (conference website) P.J.Hewson (2005), "Multilevel models for environmental applications", Societa Italiana di Statistica, University of Messina September 2005 Intermediate Conference, Statistica e ambiente - Invited Papers, pg. 197-210 ISBN 88-7178-531-2 P.J.Hewson (2005), "Multilevel models for environmental applications", RSS Local Group Meeting (South West) June 2005 P.J.Hewson (2004), "20mph; Do we make robust enough assessments of collision data and how else do we measure success?", presented at one-day conference at Aston University September 2004: "20mph is plenty: is there enough evidence?" P.J.Hewson (2004), "Are we getting better? A discussion of what modelling can reveal about trends in vulnerable road user casualties", presented at RoSPA 69th Road Safety Congress, Cardiff, March 2004. P.J.Hewson (2003), "Speed Statistics", presented at Institute of Highways and Transportation regional meeting, 6th March 2003 P.J.Hewson (2002), "Speed Statistics", presented at Institute of Road Safety Officers regional meeting: "Getting Off Speed", 30th October 2002 Reports and articles in non-peer reviewed publications
P.J.Hewson (2008) "Evidence Based Practice" Urban Design 105(Winter):29-32 (By Invitation) P.J.Hewson (2005), "Mantled in Mist, the importance of evidence in the speed camera debate", Traffic Engineering and Control, January 2005 P.J. Hewson (2004), "Separating signals from noise: assessing road safety performance indicators", Traffic Engineering and Control, 45(6): 210-213 P.J. Hewson (2002), "An exploratory data analysis of motorcycle Fatal and Serious Collisions in Devon 1996 - 2001" Devon County Council, ISBN 1-85522-894-7 P.J. Hewson (2002), "A model approach", PSBS News 2:12-13 Additional information Links
My entry on academia.edu (has some teaching materials posted)
My "engaging researcher" profile
University of Plymouth Statistics Group
http://www.cvr.cc/pdfpagediff/ |
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