Articles by xi'an

a brief on naked statistics

April 2, 2013 | xi'an

Over the last Sunday breakfast I went through Naked Statistics: Stripping the Dread from the Data. The first two pages managed to put me in a prejudiced mood for the rest of the book. To wit: the author starts with some math bashing (like, no one ever bothers to tell ... [Read more...]

Le Monde puzzle [#814]

April 1, 2013 | xi'an

The #814 Le Monde math puzzle was to find 100 digits (between 1 and 10) such that their sum is equal to their product. Given the ten possible values of those digits, this is equivalent to finding integers a1,…,a10 such that a1+…+a10=100 and a1+2a2+…+10a10=2a2x….x10a10, which reduces ...
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latent Gaussian model workshop in Reykjavik

March 28, 2013 | xi'an

An announcement for an Icelandic meeting next September, meeting I would have loved to attend (darn!)… This meeting is sponsored by the BayesComp session, of course!!! We are pleased to announce that the University of Iceland will host the 3rd Workshop on Bayesian Inference for Latent Gaussian Models with Applications (... [Read more...]

workshop a Padova

March 21, 2013 | xi'an

Needless to say, it is with great pleasure I am back in beautiful Padova for the workshop Recent Advances in statistical inference: theory and case studies, organised by Laura Ventura and Walter Racugno. Esp. when considering this is one of the last places I met with George Casella, in June 2010. ... [Read more...]

Le Monde puzzle [#810]

March 5, 2013 | xi'an

The current puzzle is as follows: Take a board with seven holes and seeds. The game starts with one player putting the seeds on the holes as he or she wishes. The other player picks a seed wherever. Then, alternatively, each player picks a seed in a hole contiguous to ...
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making a random walk geometrically ergodic

March 1, 2013 | xi'an

While a random walk Metropolis-Hastings algorithm cannot be uniformly ergodic in a general setting (Mengersen and Tweedie, AoS, 1996), because it needs more energy to leave far away starting points, it can be geometrically ergodic depending on the target (and the proposal). In a recent Annals of Statistics paper, Leif Johnson ... [Read more...]

the BUGS Book [guest post]

February 24, 2013 | xi'an

(My colleague Jean-Louis Fouley, now at I3M, Montpellier, kindly agreed to write a review on the BUGS book for CHANCE. Here is the review, en avant-première! Watch out, it is fairly long and exhaustive! References will be available in the published version. The additions of book covers with ... [Read more...]

Le Monde puzzle [#809]

February 21, 2013 | xi'an

Another number theory puzzle, completed in the plane to Hamburg: Integers n are called noble if they can be decomposed as a sum n=a+b+… of distinct integers such that 1/a+1/b+…=1. They are called bourgeois if they are not noble but can be decomposed as a sum n=...
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dbetabinom versions

February 17, 2013 | xi'an

I got this email from a student: (1) I used the following R function in package “emdbook“ more precisely I did (2) instead I use the following R function in package “VGAM“ more precisely I did and I get two different curves! Sad! to which I replied only the following as the ... [Read more...]

CHANCE: special issue on George Casella’s books

February 9, 2013 | xi'an

The special issue of CHANCE on George Casella’s books has now appeared and it contains both my earlier post on George passing away and  reviews of several of his books, as follows: Andrew Gelman on Introducing Monte Carlo Methods with R Bill Strawderman on Statistical Inference Jean-Louis Foulley on ... [Read more...]

packed off!!!

February 8, 2013 | xi'an

Deliverance!!! We have at last completed our book! Bayesian Essentials with R is off my desk! In a final nitty-gritty day of compiling and recompiling the R package bayess and the LaTeX file, we have reached versions that were in par with our expectations. The package has been submitted to ... [Read more...]

MCMSki IV, Jan. 6-8 (9?), 2014, Chamonix (news #3)

February 5, 2013 | xi'an

In case you have not been constantly tracking the changes on the MCMSki IV webpage, here are some news: the number of invited and accepted contributed sessions in the program had considerably increased, to the point of almost filling two parallel sessions for the whole duration of the meeting. This ...
[Read more...]

R finals

January 30, 2013 | xi'an

On the morning I returned from Varanasi and the ISBA meeting there, I had to give my R final exam (along with three of my colleagues in Paris-Dauphine). This year, the R course was completely in English, exam included, which means I can post it here as it may attract ... [Read more...]

local package delays

January 24, 2013 | xi'an

When Jean-Michel and I left Berlin, a month ago, I really thought we were that close to sending the new edition of Bayesian Core. Alas, we are not done yet for a series of reasons: leaving for India did not give me enough time to complete the help manual, some ... [Read more...]

from down-under, Lake Menteith upside-down

January 22, 2013 | xi'an

The dataset used in Bayesian Core for the chapter on image processing is a Landsat picture of Lake of Menteith in Scotland (close to Loch Lomond). (Yes, Lake of Menteith, not Loch Menteith!) Here is the image produced in the book. I just got an email from Matt Moores at ... [Read more...]

rencontres R à Lyon, 27-28 juin 2013

December 19, 2012 | xi'an

Simon Barthelmé just sent me the announcement that the next French R conference (Rencontres R) will be in Lyon, on June 27-28, 2013, and that the call for propositions is now open. (No possible confusion with MCMSki IV: the later is not in Lyon but Chamonix, not in June but January, ... [Read more...]

Le Monde puzzle (#800)

December 14, 2012 | xi'an

Here is the mathematical puzzle of the weekend edition of Le Monde: Consider a sequence where the initial number is between 1 and 10³, and each term in the sequence is derived from the previous term as follows: if the last digit of the previous term is between 6 and 9, multiply it by 9; [...] [Read more...]

Special Issue of ACM TOMACS on Monte Carlo Methods in Statistics

December 10, 2012 | xi'an

As posted here a long, long while ago, following a suggestion from the editor (and North America Cycling Champion!) Pierre Lécuyer (Université de Montréal), Arnaud Doucet (University of Oxford) and myself acted as guest editors for a special issue of ACM TOMACS on Monte Carlo Methods in Statistics. (... [Read more...]

Amazon associates links (warnin’)

December 4, 2012 | xi'an

As in previous years, let me warn unwary readers that the links to Amazon.com and Amazon.fr found on this blog are actually susceptible to earn me a monetary gain [from 4% to 7%] if a purchase is made in the 24 hours following the entry on Amazon through this link, thanks ... [Read more...]
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