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Seminario BELITSER
by Matteo Ruggiero 22 Oct '18

22 Oct '18

STATISTICS SEMINARS @ COLLEGIO CARLO ALBERTO Venerdì 26 Ottobre 2018, alle ore 12:00, presso il nuovo edificio del Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Eduard BELITSER (Vrije Universiteit Amsterdam) ROBUST INFERENCE FOR GENERAL PROJECTION STRUCTURES BY EMPIRICAL BAYES AND PENALIZATION METHODS We develop a general framework of projection structures and study the problem of inference on the unknown parameter within this framework by using empirical Bayes and penalization methods. The main inference problem is the uncertainty quantification, but on the way we solve the estimation and posterior contraction problems as well (also a weak version of structure recovery problem). The approach is local in that the quality of the inference procedures is measured by the local quantity, the oracle rate, which is the best trade-off between the approximation error by a projection structure and the complexity of that approximating projection structure. The approach is also robust in that the stochastic part of the general framework is assumed to satisfy only certain mild condition, the errors may be non-iid with unknown distribution. We introduce the excessive bias restriction (EBR) under which we establish the local (oracle) confidence optimality of the constructed confidence ball. As the proposed general framework unifies a very broad class of high-dimensional models interesting and important on their own right, the obtained general results deliver a whole avenue of results (many new ones and some known in the literature) for particular models and structures as consequences, including white noise model and density estimation with smoothness structure, linear regression and dictionary learning with sparsity structures, biclustering and stochastic block models with clustering structure, covariance matrix estimation with banding and sparsity structures, and many others. Many adaptive minimax results over various scales follow from our local results. (Joint work with N. Nurushev.) ------------------------------------------------ Tutti gli interessati sono invitati a partecipare. Il seminario è organizzato dalla "de Castro" Statistics Initiative (www.carloalberto.org/stats) in collaborazione con il Collegio Carlo Alberto. Cordiali saluti, Matteo Ruggiero --- Matteo Ruggiero University of Torino and Collegio Carlo Alberto www.matteoruggiero.it

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seminar announcement
by Marco Scarsini 19 Oct '18

19 Oct '18

October 25th, 2018 12:00 Room 207 *Department of Economics and Finance* LUISS Viale Romania 32 00196 Roma *Speaker:* Bernhard von Stengel / London School of Economics *Title: * *“Equilibria in the challenge tournament”* *Abstract:* *“Arad and Rubinstein (2013) describe a challenge tournament where n players have a binary choice and play a round-robin tournament where they score against each other randomly for a stake that depends on their choices. The player with the highest total score wins, with ties resolved randomly. They conjecture that for n > 3 the only equilibrium is that all players take the riskier choice. We present work in progress on an elementary proof of this conjecture which is based on a simple dominance argument.”* The calendar of the future seminars can be found at http://economiaefinanza.luiss.it/en/seminari/prossimi-seminari ******************************************************* Marco Scarsini Dipartimento di Economia e Finanza LUISS Viale Romania 32 00197 Roma, ITALY URL: http://docenti.luiss.it/scarsini/

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Winter Workshop on Complex Systems 2019 in Zakopane
by Mateusz Wilinski 18 Oct '18

18 Oct '18

Dear All, next year the Winter Workshop on Complex Systems will be held in Zakopane (Poland) from 4th to 8th February 2019. The event is tailored for PhD students and young scientists working in the broad area of Complex Systems (including problems from Biology, Physics, Finance and Economy, Machine Learning and many more). The call for participation in the 2019 edition is now open and the application deadline is 31st of October. All the details are available at: http://wwcs2019.org The cost of the workshop is just 100 euros, which includes accommodation, food, transport from Cracow, social events and more. Participants will also have the chance to interact and hear lectures from exciting scientist, namely: Fabrizio Lillo, Chiara Poletto, Pere Colet and Piotr Fronczak. I hope to see applications from many of you. :) We would also be really happy, if you could help to spread the information and encourage others to apply. Best wishes, on behalf of the organizing committee Mateusz Wilinski

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Bootstrap percolation: subcritical universality class and oriented percolation - Seminario di Ivailo Hartarsky il 24/10/18 a Roma Tre
by Pietro Caputo 16 Oct '18

16 Oct '18

Ivailo Hartarsky (ENS, France) Titolo: Bootstrap percolation : subcritical universality class and oriented percolation Mercoledi' 24 Ottobre 2018 ORE 16:00 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C - Aula 211 Abstract Bootstrap percolation is a wide class of deterministic monotone cellular automata with random initial state closely related to several other statistical physics models such as the kinetically constrained spin models for the spin glass transition. There are three `universality classes' of bootstrap percolation in two dimensions. Of them the `subcritical' ones those exhibiting a non-trivial phase transition are by far the most poorly understood. In this work we develop a first approach for studying them. We will start with a gentle introduction to the field and its universality picture to provide the necessary background. We will then introduce the main new notion of critical density and state our main result. We will then illustrate the method by applications to concrete examples yielding new and old results in the area. The approach establishes and exploits a tight connection with a new generalization of classical oriented percolation, whose further study will have a direct impact on bootstrap percolation. The talk will be based on the preprint arxiv:1806.11405.

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Assegno di ricerca presso Politecnico di Milano
by Alessandra Menafoglio 16 Oct '18

16 Oct '18

Il Dipartimento di Matematica del Politecnico di Milano ha bandito un assegno di ricerca di 12 mesi descritto in dettaglio al link https://www.polimi.it/index.php?id=3971 <https://www.polimi.it/index.php?id=3971&tx_wfqbe_pi1%5bID%5d=7923> &tx_wfqbe_pi1%5bID%5d=7923 sul tema Modellazione statistica e numerica di trasporto di sedimenti in bacini montani nell'ambito della partecipazione del laboratorio MOX al progetto della Fondazione CARIPLO SMART-SED. Eventuali interessati possono contattare <mailto:luca.bonaventura@polimi.it> luca.bonaventura(a)polimi.it <mailto:alessandra.menafoglio@polimi.it> alessandra.menafoglio(a)polimi.it per maggiori informazioni. La scadenza del bando è il 25 ottobre 2018 e la prevista data per la presa di servizio il primo dicembre 2018. Grazie in anticipo per la diffusione a tutti i potenziali interessati. Alessandra Menafoglio -- Alessandra Menafoglio MOX - Dept. of Mathematics Politecnico di Milano Piazza Leonardo da Vinci, 32, 20133, Milan Italy Phone: +39 02 2399 4642 Email: <mailto:alessandra.menafoglio@polimi.it> alessandra.menafoglio(a)polimi.it

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Seminario di Clement Erignoux il 23/10/18 a Roma Tre
by Pietro Caputo 16 Oct '18

16 Oct '18

Clement Erignoux Universita' di Roma Tre Titolo: Hydrodynamics for a non-ergodic activated exclusion process Martedi' 23 Ottobre 2018 ORE 14:30 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C Abstract The Entropy Method introduced by Guo, Papanicolaou and Varadhan (1988) has been used with great sucess to derive the scaling hydrodynamic behavior of wide ranges of conserved lattice gases (CLG). It requires to estimate the entropy of the measure of the studied process w.r.t. some nice, usually product, measure. In this talk, I will present an exclusion model inspired by a model introduced by Goncalves, Landim, Toninelli (2008), with a dynamical constraint, where a particle at site x can only jump to x+delta iff site x-delta (delta=pm1) is occupied as well. I will give some insight on the different microscopic and macroscopic situations that can occur for this model, and briefly describe the steps to derive the hydrodynamic limit for this model by adapting the Entropy Method to non-product reference measures. I will also expand on the challenges and question raised by this model and on some of its nice mapping features. Joint work with O. Blondel, M. Sasada, and M. Simon.

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Fwd: avviso seminari di Matematica proff. Paolo Butta, Michela Ottobre e Boguslaw Zegarlinski (18.10.2018)
by Franco Flandoli 13 Oct '18

13 Oct '18

SEMINARI DI MATEMATICA Giovedì 18 ottobre 2018 *Scuola Normale Superiore* Pisa Sala Conferenze, Collegio Puteano si terranno i seguenti seminari: 14:30 *Paolo Buttà* ( Università di Roma "La Sapienza"), *“On the large deviations of interface motions in statistical mechanics models”* *Abstract:* *In this talk, I consider the sharp interface limit of the action functional associated to either the Glauber dynamics for Ising systems with Kac potentials or the Glauber+Kawasaki process. The corresponding limit functionals provide, in the sense of large deviations theory, the probability of deviations from the mean curvature flow. I discuss, in the case of smooth interfaces, the derivation of these functionals, for which explicit formulae of the mobility and transport coefficients are given. This is joint work with L. Bertini and A. Pisante.* 15:20 *Michela Ottobre* (Heriot-Watt University, Edimburgh), *“Beyond the Hoermander condition”* *Abstract:* *The study of diffusion processes of elliptic and hypoelliptic type has by now produced a fully-fledged theory, involving several branches of mathematics: stochastic analysis, analysis of differential operators, (sub-)Riemannian geometry and control theory, just to mention the main players. One of the key steps in the development of such a theory has been the seminal paper of Hoermander and a large body of work has been dedicated for over 40 years to the study of diffusion processes under the Hoermander Condition (HC), which is a sufficient condition for hypoellipticity. We propose to study processes that do not, in general, satisfy the HC. In place of the HC, we wish to enforce a weaker condition, the so-called UFG condition, introduced by Kusuoka and Strook with probabilistic motivations, and, independently, by Sussman, Hermann and Lobry, this time in the field of control theory. In particular, Kusuoka and Strook showed that it is still possible to build a solid PDE theory for diffusion semigroups even in absence of the Hoermander condition. We will present new results on the geometry and long time behaviour of diffusion semigroups that do not satisfy the Hoermander condition. Our interest in UFG diffusions stems from the observation that they constitute a large class of SDEs which exhibit multiple invariant measures and such that it is possible to determine in a systematic way the basin of attraction of each equilibrium state. This is a joint work with P. Dobson (Maxwell Institute), T. Cass and D. Crisan (Imperial College).* 16:10 *Boguslaw Zegarlinski* (Imperial College London), *“Hypoelliptic diffusion in noncommutative setup”* *Abstract:* *I will review results and problems concerning hypoelliptic diffusion and coercive (Poincare and Log-Sobolev) inequalities.* Tutti gli interessati sono invitati a partecipare. Classe di Scienze Valeria Giuliani Scuola Normale Superiore Servizio alla Didattica e Allievi tel. 050 509260 Piazza dei Cavalieri, 7 56126 Pisa E-mail: valeria.giuliani(a)sns.it E-mail: classi(a)sns.it

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Politecnico di Milano - Seminario Iacopini
by Laura Maria Sangalli 12 Oct '18

12 Oct '18

Si avvisa che in data 08-11-2018, alle ore 11:30 precise, presso l'Aula Seminari "F. Saleri" VI piano, Dipartimento di Matematica, Politecnico di Milano, si svolgerà il seguente seminario: Relatore Matteo Iacopini, Università Ca’ Foscari Venezia Titolo Bayesian Dynamic Tensor Regression Sommario Multidimensional arrays (i.e. tensors) of data are becoming increasingly available and call for suitable econometric tools. We propose a new dynamic linear regression model for tensor-valued response variables and covariates that encompasses some well known multivariate models such as SUR, VAR, VECM, panel VAR and matrix regression models as special cases. For dealing with the over-parametrization and over-fitting issues due to the curse of dimensionality, we exploit a suitable parametrization based on the parallel factor (PARAFAC) decomposition which enables to achieve both parameter parsimony and to incorporate sparsity effects. Our contribution is twofold: first, we provide an extension of multivariate econometric models to account for both tensor-variate response and covariates; second, we show the effectiveness of proposed methodology in defining an autoregressive process for time-varying real economic networks. Inference is carried out in the Bayesian framework combined with Monte Carlo Markov Chain (MCMC). We show the efficiency of the MCMC procedure on simulated datasets, with different size of the response and independent variables, proving computational efficiency even with high-dimensions of the parameter space. Finally, we apply the model for studying the temporal evolution of real economic networks. Tutti gli interessati sono invitati a partecipare. Cordiali saluti, Laura Sangalli -- Laura Maria Sangalli MOX - Dipartimento di Matematica Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano - Italy tel: +39 02 2399 4554 fax: +39 02 2399 4568 email: laura.sangalli(a)polimi.it<mailto:laura.sangalli@polimi.it> url: http://mox.polimi.it/~sangalli

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Seminario VAN DER PAS
by Matteo Ruggiero 12 Oct '18

12 Oct '18

STATISTICS SEMINARS @ COLLEGIO CARLO ALBERTO Venerdì 19 Ottobre 2018, alle ore 12:00, presso il nuovo edificio del Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Stephanie VAN DER PAS (Leiden University) POSTERIOR CONCENTRATION FOR BAYESIAN REGRESSION TREES AND THEIR ENSEMBLES Since their inception in the 1980's, regression trees have been one of the more widely used nonparametric prediction methods. Tree-structured methods yield a histogram reconstruction of the regression surface, where the bins correspond to terminal nodes of recursive partitioning. Trees are powerful, yet susceptible to overfitting. Strategies against overfitting have traditionally relied on pruning greedily grown trees. The Bayesian framework offers an alternative remedy against overfitting through priors. Roughly speaking, a good prior charges smaller trees where overfitting does not occur. In this paper, we take a step towards understanding why/when do Bayesian trees and their ensembles not overfit. We study the speed at which the posterior concentrates around the true smooth regression function. We propose a spike-and-tree variant of the popular Bayesian CART prior and establish new theoretical results showing that regression trees (and their ensembles) (a) are capable of recovering smooth regression surfaces, achieving optimal rates up to a log factor, (b) can adapt to the unknown level of smoothness and (c) can perform effective dimension reduction. These results provide a piece of missing theoretical evidence explaining why Bayesian trees (and additive variants thereof) have worked so well in practice. ------------------------------------------------ Tutti gli interessati sono invitati a partecipare. Il seminario è organizzato dalla "de Castro" Statistics Initiative (www.carloalberto.org/stats) in collaborazione con il Collegio Carlo Alberto. Cordiali saluti, Matteo Ruggiero --- Matteo Ruggiero University of Torino and Collegio Carlo Alberto www.matteoruggiero.it

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numero speciale di DEF
by Rigo Pietro 10 Oct '18

10 Oct '18

La rivista Decisions in Economics and Finance (Springer) dedica un numero speciale al workshop The Mathematics of Subjective Probability (Milano, settembre 2018) Tutti gli interessati (anche se non hanno partecipato al workshop) sono invitati a sottomettere i loro lavori. La deadline e' 28 febbraio 2019. Ulteriori informazioni nel file allegato. Pietro Rigo

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12th Bayesian nonparametrics workshop
by Fabrizio Leisen 08 Oct '18

08 Oct '18

Dear All, the 12th Bayesian nonparametrics (BNP) meeting will be held in Oxford from the 24th to the 28th of June 2019: http://www.stats.ox.ac.uk/bnp12/ The Bayesian nonparametrics conference is a bi-annual international meeting bringing together leading experts and talented young researchers working on applications and theory of nonparametric Bayesian statistics. It is an official section meeting of the Bayesian Nonparametrics section of the International Society for Bayesian Analysis (ISBA). *****CALL for CONTRIBUTED TALKS**** The Scientific Committee invites submissions for possible contributed talks. The deadline for submitting a title/abstract is 15th December 2018. You can submit your abstract at: https://www.stats.ox.ac.uk/bnp12/index.html#abstract *****Call for TRAVEL SUPPORT***** The submission of applications for travel support opens on 1st October 2018 and closes on 15th December 2018. Currently, there are 35 awards that could be either travel awards or accommodation awards. The support is for junior researchers (students currently enrolled in a Dphil (PhD) programme or having graduated after 1st October 2015). The applicant agrees to present her/his work at the conference as a poster or oral if awarded the travel support. Please see the following link for further details. https://www.stats.ox.ac.uk/bnp12/index.html#travelsupport Best Wishes, Fabrizio Leisen -- Fabrizio Leisen Reader in Statistics Director of the Msc programmes in Statistics School of Mathematics, Statistics and Actuarial Sciences Sibson Building, University of Kent, Canterbury, CT2 7FS https://www.kent.ac.uk/smsas/our-people/profiles/leisen_fabrizio.html http://sites.google.com/site/fabrizioleisen/

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Dottorato in Statistica - Univ. Bocconi (2019-2020)
by Antonio Lijoi 07 Oct '18

07 Oct '18

Cari tutti, con preghiera di diffusione, inoltro l'annuncio relativo al bando (allegato) per l'ammissione al PhD in Statistics presso l'Universita' Bocconi, per l'a.a. 2019-2020. La scadenza per la presentazione delle domande e' l'1 Febbario 2019. Saluti, AL ------------------------------------------------- PhD in Statistics - a.y. 2019-2020 Call for applications for PhD student positions ------------------------------------------------- The Bocconi PhD School provides 4 scholarships for the PhD in Statistics and a position with tuition waiver. * Scholarship amount * 20.280 euro per annum in the 1st and 2nd year 15.343 euro per annum in the 3rd and 4th year Further funding is available through teaching and research assistantship. Visit www.unibocconi.eu/admissionphd for detailed information. ** Applications are due by February 1, 2019. ** Within the Bocconi PhD School, the four-year PhD program in Statistics provides a solid grounding for high level research in Statistics, Probability and Data Science. The curriculum is organized over two years of courses and two years entirely devoted to research. Students gain a deep mathematical and methodological preparation through the first-year. The second-year courses provide students with a more specialized competence and focus on topics that may be the object of the doctoral dissertation. The third and forth years are entirely devoted to research. Both theoretical and applied research, including methods for Machine Learning and Data Science, are supported and pursued. Multidisciplinary interchange with other graduate programs in Bocconi’s PhD School, as well as research experience abroad, are encouraged. Highly qualified and motivated students with M.Sc. degrees in Statistics, Mathematics, Economics, Engineering, as well as other quantitatively-oriented fields, are encouraged to apply for admission. Applicants should hold or be on their way to hold a graduate degree or equivalent. For more information about the PhD program in Statistics at Bocconi, visit www.unibocconi.eu/phdstatistics and feel free to contact: Antonio Lijoi (antonio.lijoi(a)unibocconi.it) Angela Baldassarre, PhD administrative assistant (angela.baldassarre(a)unibocconi.it) -- Antonio Lijoi Bocconi University http://mypage.unibocconi.it/antoniolijoi

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seminar announcement
by Marco Scarsini 05 Oct '18

05 Oct '18

October 11th, 2018, 12:00 *Department of Economics and Finance* *LUISS* Room 207, Viale Romania 32 00196 Roma *Speaker: *Vianney Perchet, École Normale Supérieure, Paris *Title: * *“Dynamic Pricing with Finitely Many Unknown Valuations”* *Abstract:* *“We consider revenue maximization in stochastic dynamic pricing where the distribution of buyers' private values is supported on an unknown set of points of unknown cardinality. This choice of setting is well-suited to model scenarios in which buyers are grouped in an unknown number of latent types, characterized by their private values for the good on sale. We focus on the construction of learning algorithm, using ideas and techniques from multi-armed bandit literature. We will show that if there are only two different possible, but unknown, private values, then the learning cost (called ``regret'') is not bigger than if the values are known (but not the demand at those points).We also consider the case of arbitrarily large number of private values, and show that logarithmic regret is only possible under some specific additional assumptions on the model and we provide such an algorithm.”* The calendar of the future seminars can be found at http://economiaefinanza.luiss.it/en/seminari/prossimi-seminari ******************************************************* Marco Scarsini Dipartimento di Economia e Finanza LUISS Viale Romania 32 00197 Roma, ITALY URL: http://docenti.luiss.it/scarsini/

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Seminario di E. Bisi a Milano - Bicocca (5 ottobre 2018)
by Francesco Caravenna 04 Oct '18

04 Oct '18

Scusandomi per lo scarso preavviso, segnalo il seguente seminario di probabilità che si terrà domani a Milano - Bicocca. Nell'ambito del ciclo "Insalate di matematica", venerdì 5 Ottobre alle ore 13.30 Elia Bisi (University College Dublin) terrà un seminario dal titolo: "How long does it take to go through a sequence of N queues?" nell'aula 3014 del Dipartimento di Matematica e Applicazioni dell'Università di Milano-Bicocca (edificio U5, terzo piano, via Cozzi 55, Milano). Trovate il sommario al seguente indirizzo: https://drive.google.com/file/d/1tcyQ3_hxS7SmifbmQ_ZIZT6YUHa86S-L/view?usp=… Tutti gli interessati sono invitati a partecipare. -- _________________________________________ Francesco Caravenna Dipartimento di Matematica e Applicazioni Università degli Studi di Milano-Bicocca Via Cozzi 55, 20125 Milano, Italy http://www.matapp.unimib.it/~fcaraven/ _________________________________________

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Seminario di Probabilità - Padova
by Paolo Dai Pra 04 Oct '18

04 Oct '18

SEMINARIO DI CALCOLO DELLE PROBABILITA' Ho il piacere di invitarvi al seguente seminario, che si terrà Venerdì 12 Ottobre alle 11:30, nella Sala Riunioni del VII piano della Torre Archimede, in Via Trieste 63, Padova, LUISA ANDREIS (Weierstraß-Institut für Angewandte Analysis und Stochastik - WIAS) Titolo: A large-deviations approach to the multiplicative coagulation process Abstract: At least since the days of Smoluchovski, there is a desire to understand the behaviour of large particle systems that undergo chemical reactions of coagulation type. One of the phenomena that attracts much attention is the question for the existence of a phase transition of gelation type, i.e., the appearance of a particle of macroscopic size in the system. In this talk, we consider the (non-spatial) coagulating model (sometimes called the Marcus-Lushnikov model), starting with N particles with mass one each, where each two particles coagulate after independent exponentially distributed times that depend on a given coagulation kernel, function of the two masses. We focus on the case in which the corresponding coagulation kernel is multiplicative in the two masses, hence the process is identified as the multiplicative coagulation process. This case is of particular interest also for its strong relations with the time dependent Erdös-Rényi random graph. We work for fixed time t > 0 and derive, for the number N of initial particles going to infinity, a joint large-deviations principle for all relevant quantities in the system (microscopic, mesoscopic and macroscopic particle sizes) with an explicit rate function. We deduce laws of large numbers and in particular derive from that the well-known phase transition at time t = 1, the time at which a macroscopic particle (the so-called gel) appears, as well as the Smoluchovski characterisation of the statistics of the finite-sized particles. This is a joint work with Wolfgang König and Robert Patterson (WIAS). Paolo Dai Pra

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RTDA mat/06 presso il Dipartimento di Matematica, La Sapienza.
by Faggionato, Alessandra 04 Oct '18

04 Oct '18

Buongiorno è stato pubblicato sul sito web del Dipartimento e di Ateneo il seguente bando per ricercatore a tempo determinato di tipologia A https://web.uniroma1.it/trasparenza/sites/default/files/bando%20RTD_A%202_2… n. 2_2018 per il conferimento di n. 1 posto da ricercatore a tempo determinato Settore concorsuale 01/A3 SSD: MAT/06 scadenza: 1° novembre 2018 Vi prego di trasmetterne notizia ai possibili interessati Grazie per la collaborazione Saluti Alessandra -- ************************************************* Prof. Alessandra Faggionato http://www1.mat.uniroma1.it/~faggionato/ Department of Mathematics University "La Sapienza" Piazzale Aldo Moro, 5 00185 - Rome Office 5, Phone (0039) 06 49913252 *************************************************

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1year PostDoc position @ Scuola Normale Superiore
by Daniele Tantari 04 Oct '18

04 Oct '18

A call for a one-year postdoc is open at the Scuola Normale Superiore di Pisa (Italy). The topic of the research is *“**Dynamic networks: measure, model and mitigate financial risks”* and it is funded by the Scuola Normale. The details of the call are at - ITA: *https://www.sns.it/bando/assegno-di-ricerca-la-collaborazione-al-programma-di-ricerca-%E2%80%9Creti-dinamiche-il-rischio-finanziario-misure-e-modelli%E2%80%9D <https://www.sns.it/bando/assegno-di-ricerca-la-collaborazione-al-programma-…>* - ENG: *https://en.sns.it/bando/research-contract-part-research-project-%E2%80%9Cdynamic-networks-measure-model-and-mitigate-financial <https://en.sns.it/bando/research-contract-part-research-project-%E2%80%9Cdy…>* The deadline is October 23. I would be grateful if you could forward this message to any potentially interested candidate. Thanks and all the best, Daniele Tantari

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Seminario di Alessandra Caraceni a Roma Tre il 17/10/18
by Pietro Caputo 03 Oct '18

03 Oct '18

Alessandra Caraceni (University of Bath, UK) Titolo: Polynomial mixing time for edge flips on quadrangulations. Mercoledi' 17 Ottobre 2018 ORE 16:00 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C - Aula 211 Abstract This talk will revolve around recent joint work with Alexandre Stauffer in which we give the first polynomial upper bound for the relaxation time of the edge flip Markov chain on rooted quadrangulations. A quadrangulation of size n is a connected planar graph endowed with a cellular embedding in the sphere such that all of its n faces have degree 4, considered up to orientation-preserving homeomorphisms of the sphere itself; we call it rooted when it is endowed with a distinguished oriented edge. Given a (rooted) quadrangulation of size n, a step of the Markov chain we are interested in a so-called “edge flip” consists in choosing an edge uniformly at random, deleting it and replacing it with one of the three possible edges (two when the original edge is adjacent to only one face) which, if drawn, recreate a quadrangulation. We will see how one can relate the edge flip chain on quadrangulations to a “leaf translation” chain on plane trees (which has a natural interpretation as a chain on the set of Dyck paths, and on other Catalan structures as well). Having discussed how to set up a successful comparison between the two chains which exploits the well-known bijection by Schaeffer and a specific construction of leaf translations as sequences of edge flips, we shall estimate the relaxation time of the leaf translation chain by improving on a result by Movassagh and Shor.

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4 PhD positions in Stochastics in Bochum and Essen (Germany)
by Hutzenthaler, Martin, Prof. Dr. 03 Oct '18

03 Oct '18

Dear Random, The Research Training Group High-Dimensional Phenomena in Probability - Fluctuations and Discontinuity (RTG 2131), funded by the Deutsche Forschungsgemeinschaft (DFG), invites applications for * 4 Ph.D. positions (salary scale TV-L E 13, 75%; including social benefits) for a three-year structured Ph.D. program. Start of the positions will be October 1st, 2018. The RTG is based at the faculties of mathematics at the three universities of Bochum<http://www.ruhr-uni-bochum.de/>, Dortmund<https://www.tu-dortmund.de/uni/Uni/index.html> and Duisburg/Essen<https://www.uni-due.de/>, Germany. Candidates should have obtained (or be about to obtain) a M.Sc. degree (or equivalent) in mathematics or closely related fields with excellent results, and intend to pursue graduate studies in mathematics within the research areas of the RTG. All graduate students will be expected to work towards a Ph.D. degree at one of the universities in Bochum<http://www.ruhr-uni-bochum.de/> and Duisburg/Essen<https://www.uni-due.de/>. No German language skills are required. The topics of the 4 projects are: * Probabilistic Networks * The separation of time-scales in the Buri-experiment * Applications of isomorphism theorems to continuous state Markov chains and their continuum limits * Strong convergence rates for stochastic partial differential equations For a description of the projects go to https://wiki.ruhr-uni-bochum.de/RTG2131/images/4/4b/Promotionsbeschreibunge… Applications should provide the usual documents: * letter of application * curriculum vitae * copies of certificates * Diploma/masters thesis and relevant publications if available * statement of purpose sketching the applicants' research interests The RTG particularly encourages the applications of female candidates. Disabled persons will be given preferential treatment in cases of otherwise equal qualification. Applications and inquiries should be addressed to: Prof. Dr. Peter Eichelsbacher<http://www.ruhr-uni-bochum.de/ffm/Lehrstuehle/stochastik/eichelsbacher.html>, Coordinator, GRK 2131 Faculty of Mathematics, Ruhr University of Bochum NA 3/66, Universitätsstraße 150, 44780 Bochum, Germany preferably via e-mail to peter.eichelsbacher(a)rub.de<mailto:peter.eichelsbacher@rub.de> DEADLINE: Applications are requested before august 19th 2018 Best wishes, Martin Hutzenthaler ————————————— Prof. Dr. Martin Hutzenthaler University of Duisburg Essen Thea-Leymann-Str. 9 45127 Essen, Germany Phone: +49 (0)201 183 6844 Fax: +49 (0)201 183 2381 martin.hutzenthaler(a)uni-due.de<mailto:martin.hutzenthaler@uni-due.de> https://www.uni-due.de/mathematik/ag_stochastische_analysis/

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Avviso di Seminario: Prof Leonenko
by Enrica Pirozzi 02 Oct '18

02 Oct '18

AVVISO di SEMINARIO Title: Asymptotic properties of the partition function and applications in tail index inference of heavy-tailed data. Prof. N.N. Leonenko School of Mathematics, Cardiff University, UK Abstract: Heavy tailed distributions are of considerable importance in modelling a wide range of phenomena in finance geology, hydrology, physics, queuing theory and telecommunication. We develop a new method for estimating unknown tail index for independent and dependent data. Our estimator is based on a variant of statistics sometimes called empirical structure function or partition function. Joint work with D. Grahovac (Osijek University, Croatia) and M. Taqqu (Boston University, USA). Il seminario si terrà il giorno 8 Ottobre 2018 ore 15:30 nella Aula C primo livello del Dipartimento Matematica e Applicazioni, Università di Napoli FEDERICO II, Complesso di Monte Sant'Angelo, Via Cintia, Napoli. -- Enrica Pirozzi Dipartimento di Matematica e Applicazioni Universita' di Napoli FEDERICO II Via Cintia, Monte S.Angelo, 80126, NAPOLI, ITALY Tel. 081 675634 https://www.docenti.unina.it/ENRICA.PIROZZI

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Seminario K. Colaneri - Università di Milano-Bicocca
by elena bandini 02 Oct '18

02 Oct '18

Annuncio di Seminario Speaker: Katia Colaneri (University of Leeds) Titolo: Indifference pricing of life insurance contracts in a market with longevity bounds via BSDEs under partial informations. Giovedì' 04 Ottobre 2018, ore 12:00 Dipartimento di Matematica e Applicazioni Università di Milano-Bicocca Via Cozzi 55, Milano - edificio U5 - Aula 3014 Abstract: We investigate the pricing problem of a pure endowment contract when the insurer has a limited information on the mortality intensity of the policyholder. We consider a financial market, where investments in a riskless asset, a risky asset and a longevity bond are allowed. Our modelling framework that takes into account mutual dependence between the financial and the insurance markets via an observable stochastic process, which affects the risky asset and the mortality index dynamics. Computing indifference price amounts to solve a stochastic control problem. Under partial information this methodology requires filtering techniques that can reduce the original control problem to an equivalent problem in complete information. We characterize the value function as well as the indifference price in terms of the solution to a quadratic-exponential backward stochastic differential equation. Tutti gli interessati sono invitati a partecipare. Cordialmente, Elena Bandini

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de Finetti Risk Seminar - October 2018
by Emanuela Rosazza 01 Oct '18

01 Oct '18

On behalf of the Scientific Committee of the de Finetti Risk Seminars, we are glad to invite you to participate at the following Lecture (Boundary) regularity for solutions of the Plateau problem Guido De Philippis Scuola Internazionale Superiore di Studi Avanzati Abstract: Plateau problem consists in finding the surface of minima area spanning a given boundary. Since the beginning of the 50’s the study of this problem led to the development of fundamental tools in Geometric Analysis and in the Calculus of Variations. Aim of the talk is to give an overview of the problem and of the techniques used to solve it. In the end I will also present some recent results concerning boundary regularity. LOCATION: The seminar will be held on Wednesday, October 3, at 18.00 at room 3-E4-SR03, Bocconi University, Via Rontgen 1, 3rd floor, Milano. A refreshment will be offered at 17.30. Scientific Committee: Prof. Simone Cerreia-Voglio (Univ. Bocconi) Prof. Marco Frittelli (Univ. degli Studi di Milano) Prof. Fabio Maccheroni (Univ. Bocconi) Prof. Massimo Marinacci (Univ. Bocconi) Prof. Emanuela Rosazza Gianin (Univ. Milano-Bicocca) Dott. Marco Maggis (Univ. degli Studi di Milano) ******************************************************************************************* Emanuela Rosazza Gianin Dipartimento di Statistica e Metodi Quantitativi Università di Milano-Bicocca Edificio U7 – 4° Piano Via Bicocca degli Arcimboldi, 8 20126 Milano Tel. 02 64483208 Fax. 02 64483105 e-mail: emanuela.rosazza1(a)unimib.it *******************************************************************************************

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Call for Interest: 2 Associate Professor positions
by Roberto Casarin 29 Sep '18

29 Sep '18

Dear Colleagues, The Department of Economics at the Ca’ Foscari University of Venice (DEC) invites expressions of interest for two Associate Professor positions in any area of *Economics*, *Econometrics *and *Finance*. Our Department is devoted to promoting high quality research, seminars and conference activities, with the aim of contributing to the national and international policy debate. QS ranks our Department as top 250 worldwide, Shanghai Ranking as top 300, the most recent Italian National Research Assessment ranked us as fifth economics department in Italy. The Department has been recently financed by the Italian Ministry of Education, University and Research under the program “Departments of Excellence” for the 2018/2022 period. More information about the DEC can be found at http://www.unive.it/pag/28365/. The Associate Professorships are tenured positions. Applicants should have an established track record of publications in top international journals and evidence of recognition in the international academic community, including grant application and project management. Standards of excellence in teaching are also expected. All positions will start in 2019. Applications from scholars working abroad are welcome and treated under a favorable tax waiver scheme. Knowledge of Italian is not required. *Application Instructions** *Applications should be received by October 31st, 2018. They should include a CV, and should be sent to *recruiting.dec(a)unive.it.** * There are no restrictions regarding the nationality of the applicants. DEC is an equal opportunity employer. Please note that this is a call for interest, not a job vacancy announcement. The Department will advertise job vacancies later in the year. best regards Roberto -- Roberto Casarin Professor of Econometrics IMEF Director University Ca' Foscari, Venice Address: San Giobbe 873/b 30121 Venezia, Italy Phone: +39 041.234.91.49 Web: http://venus.unive.it/r.casarin/ IMEF: http://www.unive.it/imef/ -- Nota automatica aggiunta dal sistema di posta.

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Seminario QUINTANA
by Matteo Ruggiero 28 Sep '18

28 Sep '18

STATISTICS SEMINARS @ COLLEGIO CARLO ALBERTO Venerdì 5 Ottobre 2018, alle ore 12:00, presso il nuovo edificio del Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Fernando A. QUINTANA (Pontificia Universidad Catolica de Chile) DISCOVERING INTERACTIONS USING COVARIATE INFORMED RANDOM PARTITION MODELS Combination chemotherapy treatment regimens created for patients diagnosedwith childhood acute lymphoblastic leukemia have had great success inimproving cure rates. Unfortunately, patients prescribed these types oftreatment regimens have displayed susceptibility to the onset ofosteonecrosis. Some have suggested that this is due to pharmacokineticinteraction between two agents in the treatment regimen (asparaginase anddexamethasone) and other physiological variables. Determining whichphysiological variables to consider when searching for interactions inscenarios like these, minus a priori guidance, has proved to be achallenging problem, particularly if interactions influence the responsedistribution in ways beyond shifts in expectation or dispersion only. We propose an exploratory technique that is able to discoverassociations between covariates and responses in a very general way. Theprocedure connects covariates to responses very flexibly through dependentrandom partition prior distributions, and then employs machine learningtechniques to highlight potential associations found in each cluster. Weapply the method to data produced from a study dedicated to learning whichphysiological predictors influence severity of osteonecrosis multiplicatively. ------------------------------------------------ Tutti gli interessati sono invitati a partecipare. Il seminario è organizzato dalla "de Castro" Statistics Initiative (www.carloalberto.org/stats) in collaborazione con il Collegio Carlo Alberto. Cordiali saluti, Matteo Ruggiero --- Matteo Ruggiero University of Torino and Collegio Carlo Alberto www.matteoruggiero.it

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Seminario Prof. N. Leonenko - Roma
by Luisa Beghin 28 Sep '18

28 Sep '18

*Seminario congiunto Università Sapienza - Tor Vergata, Roma* *Mercoledì 3 ottobre 2018* Ore 15:00, Aula 34 (iv piano) Dipartimento di Scienze Statistiche, Sapienza *Titolo: *Limit theorems, scaling of moments and intermittency for integrated finite variance supOU processes *Speaker:* Prof. N. Leonenko (Cardiff University, UK) *Abstract:* Superpositions of Ornstein-Uhlenbeck type (supOU) processes provide a rich class of stationary stochastic processes for which the marginal distribution and the dependence structure may be modeled independently. In this paper we investigate the limiting behavior of integrated supOU processes with finite variance. We show that after suitable normalization four different limiting processes may arise. The type of limit depends on the decay of the correlation function as well as on the characteristic triplet of the marginal distribution. SupOU processes, moreover, may exhibit intermittency, a phenomenon affecting the rate of growth of moments. We establish this rate for each of the four limiting scenarios. The rate changes at some point indicating that there is a change-point in the asymptotic behavior of absolute moments. For such a behavior to be possible, the moments in the limit theorem do not converge beyond some critical point. We show that this point is related to the dependence structure of the supOU process. The intermittency phenomenon appears also in some other models, for example, Intermittency of trawl processes. Joint work with D. Grahovac (Osijek University, Croatia) and M. Taqqu (Boston University, USA). Tutti gli interessati sono invitati ad intervenire. Cordiali saluti. Luisa Beghin *************************************************************** Luisa Beghin Dipartimento di Scienze Statistiche Fac. Ingegneria dell'Informazione, Informatica e Statistica "SAPIENZA" Università di Roma Piazzale Aldo Moro 5, 00185 Roma T (+39) 06 49910543 F (+39) 06 4959241 https://sites.google.com/site/luisabeghin/ *****************************************************************

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