Dr Igor Rodionov
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Email
igor.rodionov@essex.ac.uk -
Telephone
+44 (0) 1206 872341
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Location
3A.535, Colchester Campus
Profile
Biography
I'm a Senior Lecturer at the School of Mathematics, Statistics and Actuarial Science of the University of Essex. Previously I held a research position at Ecole Polytechnique Federale de Lausanne (Switzerland), also I was a full professor at MIPT (Russia) and leading researcher at the Russian Academy of Sciences. My research is on extreme value theory, from theoretical foundations of this theory to its applications. More specifically, now I work on problems in the following areas: *) Survival analysis for extreme events; *) Hypotheses testing and model selection for univariate extremes; *) Theory of phantom distribution functions on various spaces; *) The block quantile method for fitting models for extremes and its applications to environmental data.
Qualifications
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Doctor of Science (Russian analog of Habilitation) Steklov Mathematical Institute, (2021)
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PhD Lomonosov Moscow State University, (2014)
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MSc Lomonosov Moscow State University, (2010)
Appointments
University of Essex
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Senior Lecturer, School of Mathematics, Statistics and Actuarial Science, University of Essex (1/8/2023 - present)
Other academic
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Scientist, Chair of Statistics, École Polytechnique Fédérale de Lausanne (1/11/2022 - 31/7/2023)
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Full Professor, part-time, Department of Discrete Mathematics, Moscow Institute of Physics and Technology (9/2021 - 9/2022)
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Leading Researcher, Russian Academy of Sciences (1/2/2022 - 30/9/2022)
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Senior Researcher, Russian Academy of Sciences (1/4/2019 - 31/1/2022)
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Associate Professor, part-time, Department of Discrete Mathematics, Moscow Institute of Physics and Technology (9/2014 - 8/2021)
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Senior Researcher, Department of Probability Theory, Lomonosov Moscow State University (1/3/2016 - 31/3/2019)
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Junior Researcher, Department of Probability Theory, Lomonosov Moscow State University (1/10/2012 - 29/2/2016)
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Assistant Professor, part-time, Department of Discrete Mathematics, Moscow Institute of Physics and Technology (1/9/2012 - 31/8/2014)
Research and professional activities
Research interests
Statistics of extremes
I'm interested in a wide range of topics in statistics of extremes from theoretical aspects to practical applications.
Extreme value theory
Currently, I focus on two directions of probabilistic extreme value theory: investigation of the properties of phantom distribution functions in various spaces and their applications in statistics, and establishing extreme survival analysis which includes proving central limit theorem for censored extremes, study of the properties of extreme Kaplan-Meyer estimator etc.
Current research
Censored extreme value estimation
A novel and comprehensive methodology designed to tackle the challenges posed by extreme values in the context of random censorship is introduced. The main focus of this study revolves around the analysis of integrals based on the product-limit estimator of normalized top-order statistics, denoted extreme Kaplan–Meier integrals. These integrals allow for the derivation of various important asymptotic distributional properties, offering an alternative approach to conventional plug-in estimation methods. Notably, this methodology demonstrates robustness and wide applicability within the scope of max-domains of attraction. An additional noteworthy by-product is the extension of residual estimation of extremes to encompass all max-domains of attraction, which is of independent interest.
Location and scale free selection between distribution tail models
We consider the problem of distinguishing between two distribution tail models, under the assumption that tails from one model are lighter than tails from another. Except the distribution that we use for separating these two models, we do not assume that the distributions belong to any of the maximum domains of attraction. Two tests are proposed: a scale free and a scale and location free, and their asymptotic properties are established. The efficiency of the developed tests in comparison with the tests proposed in the literature is examined on the basis of a simulation study. We also apply our tests to real data on human mortality at extreme age in US.
Conferences and presentations
Estimation of extreme quantiles via the block quantile method with application to long precipitation series
STOR-i Extremes Workshop (STEW 2023), Lancaster University, United Kingdom, 22/9/2023
Quantile estimation for maxima of stationary sequence by the block quantile method
European Meeting of Statisticians 2023, University of Warsaw, Poland, 6/7/2023
Beyond Generalized Pareto: testing and selection of tail models
13th conference on Extreme Value Analysis, Probabilistic and Statistical Models and their Applications (EVA 2023 Milano), Bocconi University, Milan, Italy, 26/6/2023
Beyond Generalized Pareto: how to select the model for distribution tail?
German Probability and Statistics Days, Essen, 2023, University of Duisburg-Essen, Germany, 8/3/2023
Precise large deviations for m-dependent subexponential sequences
The 12th international conference in extreme value analysis, methods and its applications (EVA 2021 Edinburgh), Edinburgh, United Kingdom, 2/7/2021
On threshold selection problem for estimation of extremal index
5TH INTERNATIONAL CONFERENCE ON STOCHASTIC METHODS (ICSM-5), Moscow, Russia, 23/11/2020
Extreme value theory for dependent random variables with application to random graphs
The 8th Polish Combinatorial Conference, Poland, 16/9/2020
Discrepancy method for extremal index estimation
Extreme Value Analysis 2019 (EVA 2019 Zagreb), Zagreb, Croatia, 2/7/2019
On discrimination between two classes of distribution tails
4TH CONFERENCE OF THE INTERNATIONAL SOCIETY FOR NONPARAMETRIC STATISTICS, Fisciano, Italy, 13/6/2018
Teaching and supervision
Current teaching responsibilities
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Stochastic Processes (MA319)
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Statistics I (MA108)
Publications
Journal articles (18)
Isaev, M., Rodionov, I., Zhang, R-R. and Zhukovskii, M., Extremal independence in discrete random systems. Annales de l’Institut Henri Poincaré - Probabilités et Statistiques
Davison, AC. and Rodionov, I., (2024). Anthony C Davison and Igor Rodionov’s contribution to the Discussion of ‘Estimating means of bounded random variables by betting’ by Waudby-Smith and Ramdas. Journal of the Royal Statistical Society Series B: Statistical Methodology. 85 (1), 35-36
Rodionov, IV. and Zhukovskii, ME., (2023). The distribution of the maximum number of common neighbors in the random graph. European Journal of Combinatorics. 107, 103602-103602
Markovich, N. and Rodionov, I., (2023). Threshold selection for extremal index estimation. Journal of Nonparametric Statistics, 1-20
Kantonistova, EO. and Rodionov, IV., (2022). On Procedures for Testing the Equivalence of Distribution Tails. Doklady Mathematics. 106 (3), 436-439
Rodionov, I. and Vaičiulis, M., (2022). The Estimation of Parameters for the Tapered Pareto Distribution from Incomplete Data. Lithuanian Mathematical Journal. 62 (3), 391-411
Kogut, NS. and Rodionov, IV., (2021). On Tests for Distinguishing Distribution Tails. Theory of Probability & Its Applications. 66 (3), 348-363
Piterbarg, VI. and Rodionov, IV., (2021). Certain modern developments in stochastic extreme value theory, on occasion of 110th birthday of Boris Vladimirovich Gnedenko. Reliability: Theory and Applications. 16 (4), 16-25
Kobelkov, SG., Piterbarg, VI. and Rodionov, IV., (2021). Correction to: On maximum of Gaussian random fields having unique maximum point of its variance. Extremes. 24 (1), 85-90
Mikosch, T. and Rodionov, I., (2021). Precise large deviations for dependent subexponential variables. Bernoulli. 27 (2), 1319-1347
Jakubowski, A., Rodionov, I. and Soja-Kukieła, N., (2021). Directional phantom distribution functions for stationary random fields. Bernoulli. 27 (2), 1028-1056
Markovich, NM. and Rodionov, IV., (2020). Maxima and sums of non-stationary random length sequences. Extremes. 23 (3), 451-464
Rodionov, IV. and Sozontov, AN., (2020). On Confidence Estimation Based on Quantitative Similarity Coefficients. Automation and Remote Control. 81 (2), 320-332
Isaev, M., Rodionov, IV., Zhang, R-R. and Zhukovskii, ME., (2020). Extreme value theory for triangular arrays of dependent random variables. Russian Mathematical Surveys. 75 (5), 968-970
Piterbarg, VI. and Rodionov, IV., (2020). High excursions of Bessel and related random processes. Stochastic Processes and their Applications. 130 (8), 4859-4872
Rodionov, IV., (2019). Discrimination of Close Hypotheses about the Distribution Tails Using Higher Order Statistics. Theory of Probability & Its Applications. 63 (3), 364-380
Rodionov, IV., (2018). A Discrimination Test for Tails of Weibull-Type Distributions. Theory of Probability & Its Applications. 63 (2), 327-335
Rodionov, IV., (2018). On Discrimination between Classes of Distribution Tails. Problems of Information Transmission. 54 (2), 124-138
Grants and funding
2024
LMS Scheme 4 Research in Pairs - re University of Copenhagen visit
London Mathematical Society
