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Politecnico di Milano - Seminario Fiserova
by Alessandra Menafoglio 09 Nov '18

09 Nov '18

Si avvisa che in data 21-11-2018, alle ore 14:30 precise, presso l'Aula Seminari "F. Saleri" VI piano, Dipartimento di Matematica, Politecnico di Milano, si svolgerà il seguente seminario: Relatore Eva Fiserova, Palacky University Olomouc, Czech Republic Titolo Working with compositional data in coordinates Abstract Compositional data are multivariate observations carrying only relative information, popularly expressed in percentages, proportions, mg/kg, etc. Because of features inherent to compositional data, such as scale invariance and the relative scale, the statistical analysis of raw compositional data often leads to spurious results. Natural principles of compositional data are followed by the Aitchison geometry on a simplex, the sample space of compositional data (Aitchison, 1986; Pawlowsky-Glahn et al., 2015). However, because most standard statistical methods rely on the Euclidean geometry in real space, compositional data need to be converted to this space prior to statistical processing. In the lecture, we will present the log ratio methodology for dealing with compositional data and several types of their coordinate representations, such as orthonormal log-ratio coordinates, pivot coordinates, weighted pivot coordinates (Hron et al., 2017), or symmetric balances (Kynvclova et al., 2017). Their usage will be demonstrated on examples. Tutti gli interessati sono invitati a partecipare. Cordiali saluti, 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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Seminar announcement
by Marco Scarsini 09 Nov '18

09 Nov '18

Department of Economics and Finance LUISS Viale Romania 32 00196 Roma November 15, 2018, 12:00 noon Room 207 *Speaker: *Mathias Staudigl / Maastricht University *Title: * *“Learning in Time Varying Games”* *Abstract:* *“In this paper, we examine the long-term behavior of regret minimizing agents in time-varying games with continuous action spaces. In its most basic form, (external) regret minimization guarantees that an agent’s cumulative payoff is no worse in the long run than that of the agent’s best fixed action in hindsight. Going beyond this worst-case guarantee, we consider a dynamic regret variant that compares the agent’s accrued rewards to those of any sequence of play. Specializing to a wide class of no-regret strategies based on mirror descent, we derive explicit rates of regret minimization relying only on imperfect gradient observations. We then leverage these results to show that players are able to stay close to Nash equilibrium in time-varying monotone games – and even converge to Nash equilibrium if the sequence of stage games admits a limit.”* 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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Concorso Prof. Ordinario - DSE Univ. Verona
by Alessandro Gnoatto 08 Nov '18

08 Nov '18

Si segnala il bando seguente e si invitano tutti gli interessati a presentare domanda. Professore ordinario - 13/D4 - Metodi matematici dell'economia e delle scienze attuariali e finanziarie Pubblicato sulla Gazzetta Ufficiale - IV Serie Speciale 86 del 30 ottobre Settore scientifico-disciplinare SECS-S/06 - Metodi matematici dell'economia e delle scienze attuariali e finanziarie presso il Dipartimento di Scienze Economiche dell’Università di Verona Scadenza: 29 novembre 2018 Link al bando: https://docs.univr.it/documenti/Concorso/bando/bando993006.pdf Cordiali Saluti, Alessandro Gnoatto -- Prof Alessandro Gnoatto, PhD Dipartimento di Scienze Economiche Università degli Studi di Verona Via Cantarane 24 37129, Verona, Italy Room 1.05 Tel: +39 045 802 8537 Homepage: www.alessandrognoatto.com E-mail: alessandro.gnoatto(a)univr.it -------------------------------------------------- View my research on my SSRN Author page: http://ssrn.com/author=1615989 --------------------------------------------------

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posizione presso INRIA Bordeaux
by Marco Alessandro Fuhrman 08 Nov '18

08 Nov '18

Buongiorno. Scrivo per diffondere un avviso su una posizione presso INRIA di Bordeaux. Cordiali saluti. Marco Fuhrman Announcement: The INRIA Team CQFD is seeking qualified applicants for a permanent (full-time) INRIA research position in Bordeaux, France: https://www.inria.fr/en/centre/bordeaux We are currently focusing on the areas: stochastic modeling and simulation, optimization, control, learning. Any candidates working on such topics that would be interested in such position can contact François Dufour (francois.dufour@math.u-bordeaux.fr(javascript:main.compose()) for further information. <signaturebeforequotedtext></signaturebeforequotedtext><signatureafterquotedtext></signatureafterquotedtext>

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Seminario di Probabilita` e Stastistica
by Faggionato, Alessandra 08 Nov '18

08 Nov '18

scusate ma mancava il titolo nel mio annuncio precedente: Seminario di Probabilita` e Stastistica Martedi 13 novembre ore 14:00, Aula di Consiglio, Dipartimento di Matematica, La Sapienza. Titolo: Effects of prior selection in nonparametric Bayes problems Speaker: Tomasz Rychlil (Istituto di Matematica dell'Accademia Polacca delle Scienze) Abstract: We consider an arbitrary family of stochastically ordered distribution functions dependent on parameters from an interval in the real line. We compare distribution functions and moments of random variables with distribution functions being the mixtures of the members of the above stochastically ordered family. In particular, we determine lower and upper bounds on the values of one mixture distribution function under the condition that the other mixture distribution is arbitrarily fixed. We also evaluate the differences between the expectations of mixture variables in various scale units. The results are illustrated by some examples. -- ************************************************* 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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Seminario di Probabilita` e Statistica a Roma1
by Faggionato, Alessandra 08 Nov '18

08 Nov '18

Seminario di Probabilita` e Stastistica Martedi 13 novembre ore 14:00, Aula di Consiglio, Dipartimento di Matematica, La Sapienza. Speaker: Tomasz Rychlil (Istituto di Matematica dell'Accademia Polacca delle Scienze) Abstract: We consider an arbitrary family of stochastically ordered distribution functions dependent on parameters from an interval in the real line. We compare distribution functions and moments of random variables with distribution functions being the mixtures of the members of the above stochastically ordered family. In particular, we determine lower and upper bounds on the values of one mixture distribution function under the condition that the other mixture distribution is arbitrarily fixed. We also evaluate the differences between the expectations of mixture variables in various scale units. The results are illustrated by some examples. -- ************************************************* 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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Call for PostDoc position at University of Oslo
by Giulia Di Nunno 08 Nov '18

08 Nov '18

Dear Colleague, this is to draw your attention to the call for a PostDoc at the University of Oslo in stochastic analysis and its applications. The position is within the scopes of the project STORM “Stochastics for Time-Space Risk Models" http://www.mn.uio.no/math/english/research/projects/storm/index.html <http://www.mn.uio.no/math/english/research/projects/storm/index.html> Description and call: https://www.jobbnorge.no/en/available-jobs/job/159884/postdoctoral-research… <https://www.jobbnorge.no/en/available-jobs/job/159884/postdoctoral-research…> The deadline of application is November 30th, 2018. Please help to advertise these calls and bring them to the attention of your colleagues and possible candidates. Thank you in advance! Best wishes Giulia --- Giulia di Nunno Professor Department of Mathematics University of Oslo http://folk.uio.no/giulian/ <http://folk.uio.no/giulian/>

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seminario 13 novembre 9, 30 al Politecnico di Torino DISMA
by Enrico Bibbona 06 Nov '18

06 Nov '18

Martedi' 13 novembre alle 9,30 in Aula Buzano (Politecnico di Torino, DISMA) il prof Badal Joshi (California State University San Marcos) terrà un seminario dal titolo Graphical symmetries of reaction networks and their stationary measures Abstract: Reaction networks are used to model chemical reactions, biochemical reactions, interacting populations in ecology, genetics and infectious disease dynamics among many other systems. Depending on the system scale, three most commonly used models are continuous-time Markov chain (CTMC), stochastic differential equations and ordinary differential equations (ODE). With increased data and scientific focus shifting towards biochemistry which often involves populations as small as few tens of molecules, CTMC models have seen dramatic increase in relevance. The long-term dynamics of a continuous-time Markov chain model are described by its stationary distribution. In general, the explicit form of the stationary distribution is impossible to obtain even for very small networks. However, when the network has some natural symmetries, we can obtain the explicit stationary distribution and it can be connected with the equilibria of the corresponding ODE system. We will discuss the symmetries of reaction balance, complex balance, reaction vector balance, and cycle balance and their properties in both the deterministic (ODE) setting and stochastic (CTMC) setting. We will also discuss the relations between the various forms of balance and the connection with existence and form of the stationary distribution. Cordialmente, Enrico Bibbona Probability, Statistics and Optimization group Department of Mathematical Sciences "G. L Lagrange" Politecnico di Torino

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seminario Felix Liebrich - 22 novembre
by Emanuela Rosazza 06 Nov '18

06 Nov '18

Si avvisa che il giorno giovedì 22 novembre alle ore 14 presso l’Università di Milano- Bicocca (via degli Arcimboldi 8 - edificio U7, quarto piano- aula 4026) si terrà il seguente seminario: Speaker: Felix-Benedikt Liebrich (LMU Muenchen, Germany) Titolo: “Sharing utility and risk under (partial) law-invariance” Abstract: The so-called risk sharing problem has two variants: (1) How can an aggregation of individual utilities within a system of agents be maximised by means of distributing a certain good, or (2) how can an aggregation of individual risks be minimised by means of redistributing a certain loss the system incurs? The problem has a long history in economics and financial mathematics, and solving it in relevant infinite dimensional spaces is very challenging. Substantial results have been obtained in the context of Pareto efficiency of such sharing schemes when law-invariant (risk) preferences are involved. These rank Savage acts -- random variables -- in a way which only depends on their distribution under a fixed reference probability measure. It was shown that Pareto efficient allocations (i.e. sharing schemes) exist. For problem (1) of maximising aggregated utility, the talk presents a unifying framework in which solutions to the risk sharing problem can be found. As applications, we will discuss the existence of weakly Pareto efficient allocations, Pareto efficient allocations, and core allocations. In a second part, we solve the risk sharing problem (2) for a wide class of capital requirements determining individual risks. These will not be law-invariant functionals, but build on a law-invariant ingredient. The talk is based on joint work with Gregor Svindland. Tutti gli interessati sono invitati a partecipare. Un saluto cordiale, Emanuela ******************************************************************************************* 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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Bernoulli Society New Researcher Award
by Antonio DI CRESCENZO 01 Nov '18

01 Nov '18

The Bernoulli Society welcomes applications to the New Researcher Award 2020. Each awardee shall deliver a talk at a special invited session during the World Congress in Probability and Statistics 2020, and will receive a funding up to 1000€ to offset travel and other expenses. Bernoulli News will publish their pictures and a paragraph about their work. Eligible candidates are active researchers in Probability Theory who obtained the PhD degree on or after Jan 1st 2014 and who are regular members of the Bernoulli Society. Female candidates get 1 extra year for each child born since receiving the PhD. Candidates should apply through the web form https://goo.gl/forms/v8zDJaFUKj5IGEG73 and send the required documents to the e-mail address indicated there. Deadline: March 15th, 2019 Link: http://bernoulli-society.org/index.php/prizes/267-bernoulli-society-new-res… -- ============================================= Antonio Di Crescenzo Dipartimento di Matematica Università degli Studi di Salerno Via Giovanni Paolo II, n. 132 <https://maps.google.com/?q=Via+Giovanni+Paolo+II,+n.+132+%0D%0A84084+Fiscia…> 84084 Fisciano (SA) Italy Tel. +39-089-963349 Fax: +39-089-963303 E-mail(1): adicrescenzo(a)unisa.it E-mail(2): adicresc(a)gmail.com Web: http://www.unisa.it/docenti/antoniodicrescenzo/index =============================================

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