Publications

The methods introduced (or used) in the majority of the papers below are implemented in (or based on) the R package GJRM.

• Adeleke MO, Marra G, Baio G, O'Keeffe AG (in press)
  Thin Plate Regression Splines for Treatment Effect Estimation in a Local Randomisation Regression Discontinuity Design
  Computational Statistics and Data Analysis
  
  
• Marra G, Radice R (in press)
  Joint Modeling of Birth Outcomes Using a Copula Distributional Regression Approach
  Health Economics, doi
  
  
• Marra G, Radice R (in press)
  Modeling Physician Visit Frequency and Costs Using a Copula Additive Distributional Regression Approach
  Journal of the Royal Statistical Society Series C, doi
  
  
• Marra G, Radice R (in press)
  Bivariate Copula-Based Regression for Joint Modeling of Healthcare Visits
  Health Economics, doi
  
  
• Bussing A, Marra G, Fan D, Shinohara R, Tu D, Ho YY (2025)
  scCOSMiX: A Mixed-Effects Framework for Differential Coexpression and Transcriptional Interactions Modeling in Single-Cell RNA-Seq
  Statistics in Medicine, 44(18-19), 1-14, doi
  
  
• Yang S, Bussing A, Marra G, Brinkmeier ML, Camper SA, Davis SW, Ho YY (2025)
  TIME-CoExpress: Temporal Trajectory Modeling of Dynamic Gene Co-expression Patterns Using Single-Cell Transcriptomics Data
  BMC Bioinformatics, 26(199), 1-26, doi
  
  
• Cardenas-Hurtado C, Moustaki I, Chen Y, Marra G (2025)
  Generalized Latent Variable Models for Location, Scale, and Shape parameters
  Psychometrika, doi
  
  
• Hagemann N, Marra G, Bretz F, Mollenhoff K (2024)
  Testing for Similarity of Multivariate Mixed Outcomes using Generalised Joint Regression Models with Application to Efficacy-Toxicity Responses
  Biometrics, 80(3), 1-11, doi
  
  
• Dorn F, Radice R, Marra G, Kneib T (2024)
  A Bivariate Relative Poverty Line for Time and Income Poverty: Detecting Intersectional Differences Using Distributional Copulas
  Review of Income and Wealth, 70(2), 395-419, doi
  
  
• Marra G, Radice R, Zimmer D (2024)
  A Unifying Switching Regime Regression Framework with Applications in Health Economics
  Econometric Reviews, 43(1), 52-70, doi
  
  
• Marra G, Fasiolo M, Radice R, Winkelmann R (2023)
  A Flexible Copula Regression Model with Bernoulli and Tweedie Margins for Estimating the Effect of Spending on Mental Health
  Health Economics, 32(6), 1305-1322, doi
  
  
• Marra G, Radice R, Quaresma M, Eletti A, Rubio FJ (2023)
  Software Review: Excess Hazard Modelling with R Package GJRM
  LiDS Newsletter, 8(2), doi
  
  
• Eletti A, Marra G, Radice R (2023)
  A Spline-Based Framework for the Flexible Modelling of Continuously Observed Multistate Survival Processes
  Statistical Modelling, 23(5-6), 495-509, doi
  
  
• Eletti A, Marra G, Quaresma M, Radice R, Rubio FJ (2022)
  A Unifying Framework for Flexible Excess Hazard Modeling with Applications in Cancer Epidemiology
  Journal of the Royal Statistical Society Series C, 71(4), 1044-1062, doi
  
  
• Ranjbar S, Cantoni E, Chavez-Demoulin V, Marra G, Radice R, Jaton-Ogay K (2022)
  Modelling the Extremes of Seasonal Viruses and Hospital Congestion: The Example of Flu in a Swiss Hospital
  Journal of the Royal Statistical Society Series C, 71(4), 884-905, doi
  
  
• Filippou P, Marra G, Radice R, Zimmer D (2022)
  Estimating the Impact of Medical Care Usage on Work Absenteeism by a Trivariate Probit Model with Two Binary Endogenous Explanatory Variables
  AStA Advances in Statistical Analysis, doi
  
  
• Palma AM, Marra G, ..., Harling G (2022)
  Correcting for Selection Bias in HIV Prevalence Estimates: An Application of Sample Selection Models Using Data from Population-Based HIV Surveys in Seven Sub-Saharan African Countries
  Journal of the International AIDS Society, 25, e25954, doi
  
  
• Petti D, Eletti A, Marra G, Radice R (2022)
  Copula Link-Based Additive Models for Bivariate Time-to-Event Outcomes with General Censoring Scheme
  Computational Statistics and Data Analysis, 107550, doi
  
  
• Hohberg M, Donat F, Marra G, Kneib T (2021)
  Beyond Unidimensional Poverty Analysis Using Distributional Copula Models for Mixed Ordered-Continuous Outcomes
  Journal of the Royal Statistical Society Series C, 70(5), 1365-1390, doi
  
  
• Marra G, Radice R, Zimmer D (2021)
  Did the ACA's Guaranteed Issue Provision Cause Adverse Selection into Nongroup Insurance? Analysis Using a Copula-Based Hurdle Model
  Health Economics, 30(9), 2246-2263, doi
  
  
• Geminiani E, Marra G, Moustaki I (2021)
  Single and Multiple-Group Penalized Factor Analysis: A Trust-Region Algorithm Approach with Integrated Automatic Multiple Tuning Parameter Selection
  Psychometrika, 86(1), 65-95, doi, R package penfa
  
  
• Aeberhard WH, Cantoni E, Marra G, Radice R (2021)
  Robust Fitting for Generalized Additive Models for Location, Scale and Shape
  Statistics and Computing, 31(11), 1-16, doi
  
  
• Marra G, Farcomeni A, Radice R (2021)
  Link-Based Survival Additive Models under Mixed Censoring to Assess Risks of Hospital-Acquired Infections
  Computational Statistics and Data Analysis, 155, 107092, doi
  
  
• Machado RJM, Van den Hout A, Marra G (2021)
  Penalised Maximum Likelihood Estimation in Multi-State Models for Interval-Censored Data
  Computational Statistics and Data Analysis, 153, 107057, doi
  
  
• Marra G, Radice R (2020)
  Copula Link-Based Additive Models for Right-Censored Event Time Data
  Journal of the American Statistical Association, 115(530), 886-895, doi
  
  
• Marra G, Radice R, Zimmer D (2020)
  Estimating the Binary Endogenous Effect of Insurance on Doctor Visits by Copula-Based Regression Additive Models
  Journal of the Royal Statistical Society Series C, 69(4), 953-971, doi
  
  
• Van der Wurp H, Groll A, Kneib T, Marra G, Radice R (2020)
  Generalised Joint Regression for Count Data - A Penalty Extension for Competetive Settings
  Statistics and Computing, 30, 1419-1432, doi
  
  
• Dettoni R, Marra G, Radice R (2020)
  Generalized Link-Based Additive Survival Models with Informative Censoring
  Journal of Computational and Graphical Statistics, 29(3), 503-512, doi
  
  
• Hajmohammadi H, Marra G, Heydecker B (2019)
  Data-Driven Models for Microscopic Vehicle Emissions
  Transportation Research Part D: Transport and Environment, 76, 138-154, doi
  
  
• Palmer E, Klapaukh R, Marra G, MacCallum N, Brealey D, Ercole A, Jones A, Ashworth S, Watkinson P, Beale R, Brett SJ, Young JD, Black C, Rashan A, Martin D, Singer M, Harris S (2019)
  The Association Between Supra-Physiologic Arterial Oxygen Levels and Mortality in Critically ill Patients: A Multi-Centre Observational Cohort Study
  American Journal of Respiratory and Critical Care Medicine, 200(11), 1373-1380, doi
  
  
• Espasandin-Dominguez J, Cadarso-Suarez C, Kneib T, Marra G, Klein N, Radice R, Lado-Baleato O, Quintela G, Gude F (2019)
  Assessing the Relationship Between Markers of Glycemic Control through Flexible Copula Regression Models
  Statistics in Medicine, 38(27), 5161-5181, doi
  
  
• Klein N, Kneib T, Marra G, Radice R (2019, chapter in book)
  Bayesian Mixed Binary-Continuous Copula Regression with an Application to Childhood Undernutrition
  In Dortet-Bernadet, Fan, Nott, Smith (Eds.), Flexible Bayesian Regression Modelling. Elsevier
  
  
• Filippou P, Kneib T, Marra G, Radice R (2019)
  A Trivariate Additive Regression Model with Arbitrary Link Functions and Varying Correlation Matrix
  Journal of Statistical Planning and Inference, 199, 236-248, doi
  
  
• Klein N, Kneib T, Marra G, Radice R, Rokicki S, McGovern ME (2019)
  Mixed Binary-Continuous Copula Regression Models with Application to Adverse Birth Outcomes
  Statistics in Medicine, 38(3), 413-436, doi
  
  
• Gomes M, Radice R, Camarena-Brenes J, Marra G (2019)
  Copula Selection Models for Non-Gaussian Outcomes that Are Missing Not at Random
  Statistics in Medicine, 38(3), 480-496, doi
  
  
• Marincioni V, Marra G, Altamirano-Medina H (2018)
  Development of Predictive Models for the Probabilistic Moisture Risk Assessment of Internal Wall Insulation
  Building and Environment, 137, 5257-267, doi
  
  
• Wojtys M, Marra G, Radice R (2018)
  Copula Based Generalized Additive Models for Location, Scale and Shape with Non-Random Sample Selection
  Computational Statistics and Data Analysis, 127, 1-14, doi
  
  
• Donat F, Marra G (2018)
  Simultaneous Equation Penalized Likelihood Estimation of Vehicle Accident Injury Severity
  Journal of the Royal Statistical Society Series C, 67(4), 979-1001, doi
  
  
• Wyszynski K, Marra G (2018)
  Sample Selection Models for Count Data in R
  Computational Statistics, 33(3), 1385-1412, doi
  
  
• Braumoeller BF, Marra G, Radice R, Bradshaw A (2018)
  Flexible Causal Inference for Political Science
  Political Analysis, 26(1), 54-71, doi
  
  
• Filippou P, Marra G, Radice R (2017)
  Penalized Likelihood Estimation of a Trivariate Additive Probit Model
  Biostatistics, 18(3), 569-585, doi
  
  
• Marra G, Radice R (2017)
  Bivariate Copula Additive Models for Location, Scale and Shape
  Computational Statistics and Data Analysis, 112, 99-113, doi
  
  
• Harling G, Moyo S, McGovern ME, Mabaso M, Marra G, Barnighausen T, Rehle T (2017)
  National South African HIV Prevalence Estimates Robust Despite Substantial Test Non-Participation
  South Africa Medical Journal, 107(7), 590-594, doi
  
  
• Marra G, Radice R, Barnighausen T, Wood SN, McGovern ME (2017)
  A Simultaneous Equation Approach to Estimating HIV Prevalence with Non-Ignorable Missing Responses
  Journal of the American Statistical Association, 112(518), 484-496, doi
  
  
• Donat F, Marra G (2017)
  Semi-parametric Bivariate Polychotomous Ordinal Regression
  Further material
  Statistics and Computing, 27(1), 283-299, doi
  
  
• Duarte E, de Sousa B, Cadarso-Suarez C, Espasandin-Dominguez J, Lado-Baleato O, Marra G, Radice R, Rodrigues V (2017, conference paper)
  Applying Spatial Copula Additive Regression to Breast Cancer Screening Data
  Computational Science and Its Applications, ICCSA 2017, Lecture Notes in Computer Science, 10405, Springer, doi
  
  
• Marra G, Radice R (2017)
  A Joint Regression Modeling Framework for Analyzing Bivariate Binary Data in R
  Dependence Modeling, 5, 268-294, doi
  
  
• Marra G, Wyszynski K (2016)
  Semi-Parametric Copula Sample Selection Models for Count Responses
  Computational Statistics and Data Analysis, 104, 110-129, doi
  
  
• Ciurtin C, Wyszynski K, Clarke R, Mouyis M, Manson J, Marra G (2016)
  Ultrasound-Detected Subclinical Inflammation was Better Reflected by the Disease Activity Score (DAS28) in Patients with Suspicion of Inflammatory Arthritis Compared to Established Rheumatoid Arthritis
  Clinical Rheumatology, 35(10), 2411-2419, doi
  
  
• Radice R, Marra G, Wojtys M (2016)
  Copula Regression Spline Models for Binary Outcomes
  Statistics and Computing, 26(5), 981-995, doi
  
  
• Marra G, Radice R, Filippou P (2017)
  Testing the Hypothesis of Exogeneity in Regression Spline Bivariate Probit Models
  Communications in Statistics - Simulation and Computation, 46(3), 2283-2298, doi
  
  
• Calabrese R, Marra G, Osmetti SA (2016)
  Bankruptcy Prediction of Small and Medium Enterprises Using a Flexible Binary Generalized Extreme Value Model
  Journal of the Operational Research Society, 67(4), 604-615, doi
  
  
• Wojtys M, Marra G, Radice R (2016)
  Copula Regression Spline Sample Selection Models: The R Package SemiParSampleSel
  Journal of Statistical Software, 71(6), 1-66, doi
  
  
• McGovern ME, Marra G, Radice R, D Canning, ML Newell, Barnighausen T (2015)
  Adjusting for Non-Participation Bias at an HIV Surveillance Site in Rural South Africa
  Journal of the International AIDS Society, 18(19954), doi
  
  
• McGovern ME, Barnighausen T, Marra G, Radice R (2015)
  On the Assumption of Joint Normality in Selection Models: A Copula Approach Applied to Estimating HIV Prevalence
  Epidemiology, 26(2), 229-237, doi
  
  
• Zanin L, Radice R, Marra G (2015)
  Modelling the Impact of Women's Education on Fertility in Malawi
  Journal of Population Economics, 28(1), 89-111, doi
  
  
• Marra G, Radice R, Missiroli S (2014)
  Testing the Hypothesis of Absence of Unobserved Confounding in Semiparametric Bivariate Probit Models
  Computational Statistics, 29(3-4), 715-741, doi
  
  
• Zanin L, Radice R, Marra G (2014)
  A Comparison of Approaches for Estimating the Effect of Women's Education on the Probability of Using Modern Contraceptive Methods in Malawi
  The Social Science Journal, 51(3), 361-367, doi
  
  
• Radice R, Zanin L, Marra G (2013)
  On the Effect of Obesity on Employment in the Presence of Observed and Unobserved Confounding
  Statistica Neerlandica, 67(4), 436-455, doi
  
  
• Marra G, Radice R (2013)
  A Penalized Likelihood Estimation Approach to Semiparametric Sample Selection Binary Response Modeling
  Electronic Journal of Statistics, 7, 1432-1455, doi
  
  
• Marra G, Radice R (2013)
  Estimation of a Regression Spline Sample Selection Model
  Computational Statistics and Data Analysis, 61, 158-173, doi
  
  
• Sobotka F, Radice R, Marra G, Kneib T (2013)
  Estimating the Relationship of Women's Education and Fertility in Botswana Using an Instrumental Variable Approach to Semiparametric Expectile Regression
  Journal of the Royal Statistical Society Series C, 62(1), 25-45, doi
  
  
• Marra G (2013)
  On P-values for Semiparametric Bivariate Probit Models
  Statistical Methodology, 10(1), 23-28, doi
  
  
• Marra G, Papageorgiou G, Radice R (2013)
  Estimation of a Semiparametric Recursive Bivariate Probit Model with Nonparametric Mixing
  Australian & New Zealand Journal of Statistics, 55(3), 321-342, doi
  
  
• Zanin L, Radice R, Marra G (2013)
  Estimating the Effect of Perceived Risk of Crime on Social Trust in the Presence of Endogeneity Bias
  Social Indicators Research, 114(2), 523-547, doi
  
  
• Marra G, Wood SN (2012)
  Coverage Properties of Confidence Intervals for Generalized Additive Model Components
  Scandinavian Journal of Statistics, 39(1), 53-74, doi
  
  
• Marra G, Miller DL, Zanin L (2012)
  Modelling the Spatiotemporal Distribution of the Incidence of Resident Foreign Population
  Statistica Neerlandica, 66(2), 133-160, doi
  
  
• Zanin L, Marra G (2012)
  Assessing the Functional Relationship Between CO2 Emissions and Economic Development Using an Additive Mixed Model Approach
  Economic Modelling, 29(4), 1328-1337, doi
  
  
• Zanin L, Marra G (2012)
  Rolling Regression Versus Time-Varying Coefficient Modelling: An Empirical Investigation of the Okun's Law in Some Euro Area Countries
  Bulletin of Economic Research, 64(1), 91-108, doi
  
  
• Zanin L, Marra G (2012)
  A Comparative Study of the Use of Generalized Additive Models and Generalized Linear Models in Tourism Research
  International Journal of Tourism Research, 14(5), 451-468, doi
  
  
• Marra G, Radice R (2011)
  Estimation of a Semiparametric Recursive Bivariate Probit Model in the Presence of Endogeneity
  Canadian Journal of Statistics, 39(2), 259-279, doi
  
  
• Marra G, Wood SN (2011)
  Practical Variable Selection for Generalized Additive Models
  Computational Statistics and Data Analysis, 55(7), 2372-2387, doi
  
  
• Marra G, Radice R (2011)
  A Flexible Instrumental Variable Approach
  Statistical Modelling, 11(6), 581-603, doi
  
  
• Marra G, Radice R (2011)
  Do We Adequately Control for Unmeasured Confounders when Estimating the Short-Term Effect of Air Pollution on Mortality?
  Water, Air, & Soil Pollution, 218(1-4), 347-352, doi
  
  
• Marra G, Radice R (2010)
  Penalised Regression Splines: Theory and Application to Medical Research
  Statistical Methods in Medical Research, 19(2), 107-125, doi