## Archive for conference

## random matrix advances

Posted in pictures, Statistics with tags Alan Turing, conference, machine learning, Paris, random matrices on October 23, 2017 by xi'an## OBayes 17 travel support

Posted in Statistics with tags Austin, conference, funding, ISBA, new researchers, O'Bayes17, objective Bayes, Texas, The University of Texas at Austin, travel grant on September 1, 2017 by xi'an**T**he OBayes 17 conference in Austin, Texas, next December is getting nearer! This post is to advertise for the availability of a dozen travel grants for junior investigators, as detailed on the webpage of the conference. One of those grants will even become an *ISBA New Researchers Travel Award* for the event! This comes on top of registration and accommodation being quite reasonable, thanks to Peter Mueller’s efforts, and hence makes this conference most affordable and attractive for young researchers. Apply now!!!

## Takaisin helsinkiin

Posted in pictures, Statistics, Travel with tags ABCruise, conference, EMS 2017, Europe, ferry harbour, Finland, folded Markov chain, Helsinki, North, Randal Douc, Scandinavia on July 23, 2017 by xi'an**I** am off tomorrow morning to Helsinki for the European Meeting of Statisticians (EMS 2017). Where I will talk on how to handle multiple estimators in Monte Carlo settings (although I have not made enough progress in this direction to include anything truly novel in the talk!) Here are the slides:

I look forward this meeting, as I remember quite fondly the previous one I attended in Budapest. Which was of the highest quality in terms of talks and interactions. (I also remember working hard with Randal Douc on a yet-unfinished project!)

## a trip back in time [and in Rouen]

Posted in Kids, pictures, Running, Statistics, Travel, University life with tags CNRS, conference, determinantal point process, France, Gérard Granger, Normandy, Rouen, travelling salesman, Université de Rouen, vulgarisation on June 24, 2017 by xi'an**O**n Monday, I took part in a celebration of the remarkable career of a former colleague of mine in Rouen, Gérard Grancher, who is retiring after a life-long position as CNRS engineer in the department of maths of the University of Rouen, a job title that tells very little about the numerous facets of his interactions with mathematics, from his handling of all informatics aspects in the laboratory to his support of all colleagues there, including fresh PhD students like me in 1985!, to his direction of the CNRS lab in 2006 and 2007 at a time of deep division and mistrust, to his numerous collaborations on statistical projects with local actors, to his Norman federalism in bringing the maths departments of Caen and Rouen into a regional federation, to an unceasing activism to promote maths in colleges and high schools and science fairs all around Normandy, to his contributions to professional training in statistics for CNRS agents, and much, much more… Which explains why the science auditorium of the University of Rouen was packed with mathematicians and high schools maths teachers and friends! (The poster of the day was made by Gérard’s accomplices in vulgarisation, Élise Janvresse and Thierry Delarue, based on a sample of points randomly drawn from Gérard’s picture, maybe using a determinantal process, and the construction of a travelling salesman path over those points.)

This was a great day with mostly vulgarisation talks (including one about Rasmus’ socks..!) and reminiscences about Gérard’s carreer at Rouen. As I had left the university in 2000 to move to Paris-Dauphine, this was a moving day as well, as I met with old friends I had not seen for ages, including our common PhD advisor, Jean-Pierre Raoult.

This trip back in time was also an opportunity to (re-)visit the beautifully preserved medieval centre of Rouen, with its wooden houses, Norman-style, the numerous churches, including Monet‘s cathedral, the Justice Hall… Last time I strolled those streets, George Casella was visiting!

## on Dutch book arguments

Posted in Books, Kids, pictures, Statistics, Travel, University life with tags Bayesian foundations, bookmaker, coherence, conference, Dutch book argument, gambling, Harvard University, incoherent inference, Jim Berger, Neyman-Pearson tests on May 1, 2017 by xi'an

“Reality is not always probable, or likely.”― Jorge Luis Borges

**A**s I am supposed to discuss Teddy Seidenfeld‘s talk at the Bayes, Fiducial and Frequentist conference in Harvard today [the snow happened last time!], I started last week [while driving to Wales] reading some related papers of his. Which is great as I had never managed to get through the Dutch book arguments, including those in Jim’s book.

The paper by Mark Schervish, Teddy Seidenfeld, and Jay Kadane is defining *coherence* as the inability to bet against the predictive statements based on the procedure. A definition that sounds like a self-fulfilling prophecy to me as it involves a probability measure over the parameter space. Furthermore, the notion of turning inference, which aims at scientific validation, into a leisure, no-added-value, and somewhat ethically dodgy like gambling, does not agree with my notion of a validation for a theory. That is, not as a compelling reason for adopting a Bayesian approach. Not that I have suddenly switched to the other [darker] side, but I do not feel those arguments helping in any way, because of this dodgy image associated with gambling. (Pardon my French, but each time I read about *escrows*, I think of *escrocs*, or *crooks*, which reinforces this image! Actually, this name derives from the Old French *escroue*, but the modern meaning of *écroué* is sent to jail, which brings us back to the same feeling…)

Furthermore, it sounds like both a weak notion, since it implies an almost sure loss for the bookmaker, plus coherency holds for *any* prior distribution, including Dirac masses!, and a frequentist one, in that it looks at all possible values of the parameter (in a statistical framework). It also turns errors into monetary losses, taking them at face value. Which sounds also very formal to me.

But the most fundamental problem I have with this approach is that, from a Bayesian perspective, it does not bring any evaluation or ranking of priors, and in particular does not help in selecting or eliminating some. By behaving like a minimax principle, it does not condition on the data and hence does not evaluate the predictive properties of the model in terms of the data, e.g. by comparing pseudo-data with real data.

While I see no reason to argue in favour of p-values or minimax decision rules, I am at a loss in understanding the examples in How to not gamble if you must. In the first case, i.e., when dismissing the α-level most powerful test in the simple vs. simple hypothesis testing case, the argument (in Example 4) starts from the classical (Neyman-Pearsonist) statistician favouring the 0.05-level test over others. Which sounds absurd, as this level corresponds to a given loss function, which cannot be compared with another loss function. Even though the authors chose to rephrase the dilemma in terms of a single 0-1 loss function and then turn the classical solution into the choice of an implicit variance-dependent prior. Plus force the poor Pearsonist to make a wager represented by the risk difference. The whole sequence of choices sounds both very convoluted and far away from the usual practice of a classical statistician… Similarly, when attacking [in Section 5.2] the minimax estimator in the Bernoulli case (for the corresponding proper prior depending on the sample size n), this minimax estimator is admissible under quadratic loss and still a Dutch book argument applies, which in my opinion definitely argues *against* the Dutch book reasoning. The way to produce such a domination result is to mix two Bernoulli estimation problems for two different sample sizes but the *same* parameter value, in which case there exist [other] choices of Beta priors and a convex combination of the risks functions that lead to this domination. But this example [Example 6] mostly exposes the artificial nature of the argument: when estimating the *very same* probability θ, what is the relevance of adding the risks or errors resulting from using two estimators for two different sample sizes. Of the *very same* probability θ. I insist on the *very same* because when instead estimating two [independent] values of θ, there cannot be a Stein effect for the Bernoulli probability estimation problem, that is, any aggregation of admissible estimators remains admissible. (And yes it definitely sounds like an exercise in frequentist decision theory!)

## Statlearn17, Lyon

Posted in Kids, pictures, R, Statistics, Travel, University life with tags Berlin, conference, France, French Alps, Lyon, machine learning, R, SFDS, Statlearn 2017, train, Université Lumière Lyon 2 on April 6, 2017 by xi'an**T**oday and tomorrow, I am attending the Statlearn17 conference in Lyon, France. Which is a workshop with one-hour talks on statistics and machine learning. And which makes for the second workshop on machine learning in two weeks! Yesterday there were two tutorials in R, but I only took the train to Lyon this morning: it will be a pleasant opportunity to run tomorrow through a city I have not truly ever visited, if X’ed so many times driving to the Alps. Interestingly, the trip started in Paris with me sitting in the train next to another speaker at the conference, despite having switched seat and carriage with another passenger! Speaker whom I did not know beforehand and could only identify him by his running R codes at 300km/h.

## GG Day in Rouen

Posted in Kids, pictures, Statistics, Travel, University life with tags Cédric Villani, CNRS, conference, fractals, France, Gérard Granger, GG Day, Madrillet, Pascal, Raphaël Salem, retirement, Rouen, scientific word on March 26, 2017 by xi'an*[Notice: This post is fairly “local” in that it is about a long-time friend being celebrated by his university. Nice poster though and an opportunity to stress his essential contributions to the maths department there!]*

**N**ext June, I will spend the day in Rouen for a conference celebrating the career and dedication of Gérard Grancher to mathematics and the maths department there. (When I got invited I had not realised I was to give *the* research talk of the day!) Gérard Granger is a CNRS engineer and a statistician who is indissociable from the maths department in Rouen, where he spent his whole career, now getting quite close to [mandatory] retirement! I am very happy to take part in this celebration as Gérard has always been an essential component of the department there, driving the computer structure, reorganising the library, disseminating the fun of doing maths to high schools around and to the general public, and always a major presence in the department, whom I met when I started my PhD there (!) Working on the local computers in Pascal and typing my thesis with scientific word (!!)