Articles by xi'an

Statistics and Computing special MCMSk’issue [call for papers]

February 6, 2014 | xi'an

Following the exciting and innovative talks, posters and discussions at MCMski IV, the editor of Statistics and Computing, Mark Girolami (who also happens to be the new president of the BayesComp section of ISBA, which is taking over the management of future MCMski meetings), kindly proposed to publish a special ... [Read more...]

cut, baby, cut!

January 28, 2014 | xi'an

At MCMSki IV, I attended (and chaired) a session where Martyn Plummer presented some developments on cut models. As I was not sure I had gotten the idea [although this happened to be one of those few sessions where [Read more...]

Statistical modeling and computation [book review]

January 21, 2014 | xi'an

Dirk Kroese (from UQ, Brisbane) and Joshua Chen (from ANU, Canberra) just published a book entitled Statistical Modeling and Computation, distributed by Springer-Verlag (I cannot tell which series it is part of from the cover or frontpages…) The book is intended mostly for an undergrad audience (or for graduate students ... [Read more...]

Le Monde puzzle [#849]

January 18, 2014 | xi'an

A straightforward Le Monde mathematical puzzle: Find a pair (a,b) of integers such that a has an odd number d of digits larger than 2 and ab is written as 10d+1+10a+1. Find the smallest possible values of a and of b. I ran the following R code which produced ...
[Read more...]

MCMSki IV [mistakes and regrets]

January 12, 2014 | xi'an

Now that the conference and the Bayesian non-parametric satellite workshop (thanks to Judith!) are over, with (almost) everyone back home, and that the post-partum conference blues settles in (!), I can reflect on how things ran for those meetings and what I could have done to improve them… (Not yet considering ... [Read more...]

MCMSki IV [day #3]

January 8, 2014 | xi'an

Already on the final day..! And still this frustration in being unable to attend three sessions at once… Andrew Gelman started the day with a non-computational talk that broached on themes that are familiar to readers of his blog, on the misuse of significance tests and on recommendations for better ... [Read more...]

MCMSki IV [day 1.5]

January 7, 2014 | xi'an

The afternoon sessions I attended were “Computational and Methodological Challenges in evidence synthesis and multi-step” organised by Nicky Best and Sylvia Richardson and “Approximate inference” put together by Dan Simpson. Since both Nicky and Sylvia were alas unable to attend MCMSki, I chaired their session, which I found most interesting ... [Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #18)

January 6, 2014 | xi'an

MCMSki IV is about to start! While further participants may still register (registration is still open!), we are currently 223 registered participants, without accompanying people. I do hope most of these managed to reach the town of Chamonix-Mont-Blanc despite the foul weather on the East Coast. Unfortunately, three speakers (so far) ... [Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #17)

January 3, 2014 | xi'an

We are a few days from the start, here are the latest items of information for the participants: The shuttle transfer on January 5th, from Geneva Airport to Chamonix lasts 1 hour 30 minutes. At your arrival in the airport , follow the “Swiss Exit”. After the customs, the bus driver (handling a ... [Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #16)

December 30, 2013 | xi'an

I am now in Chamonix, a week before MCMSki IV. The town is packed with tourists from all over Europe, English being the dominant language. There is not much snow so far, even though some runs reach town. (I did ski in the nearby Les Houches today and the red ... [Read more...]

Le Monde puzzle [#847]

December 28, 2013 | xi'an

Another X’mas Le Monde mathematical puzzle: A regular dice takes the values 4, 8 and 2 on three adjacent faces. Summit values are defined by the product of the three connected faces, e.g., 64 for the above. What values do the three other faces take if the sum of the eight summit ...
[Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #14)

December 26, 2013 | xi'an

The programs of the talks, posters and workshop are now printed and available on Speaker Deck (talks, posters, workshop). Please let me know if you spot anything wrong (even though it will not be reprinted!). This is presumably the last news item till Jan. 5 as I am almost off to ... [Read more...]

Le Monde puzzle [#843]

December 13, 2013 | xi'an

A straightforward Le Monde mathematical puzzle: Find integers x with 4 to 8 digits which are (a) perfect squares x=y² such that [x/100] is also a perfect square; (b) perfect cubes x=y³ such that [x/1000] is also a perfect cube; (c) perfect cubes x=y³ such that [...
[Read more...]

sudoku break

December 12, 2013 | xi'an

While in Warwick last week, one evening after having exhausted my laptop battery, I tried the following Sudoku (from Libération): and could not even start. As it happened, this was a setting with no deterministic move, i.e. all free/empty entries had multiple possible values. So after trying ... [Read more...]

amazonly associated thanks (& warnin’)

December 8, 2013 | xi'an

Following a now well-established pattern, let me (re)warn (the few) unwary ‘Og readers that the links to Amazon.com and to Amazon.fr found on this blog are actually susceptible to earn me a monetary gain [from 4% to 8% on the sales] if a purchase is made by the reader ... [Read more...]

Le Monde puzzle [#842]

November 29, 2013 | xi'an

An easily phrased (and solved?) Le Monde mathematical puzzle that does not [really] require an R code: The five triplets A,B,C,D,E are such that and Given that find the five triplets. Adding up both sets of equations shows everything solely depends upon E1… So running an ...
[Read more...]

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #12)

November 26, 2013 | xi'an

We are converging towards MCMSki IV getting closer and closer to the conference! I hope that by now all intended participants have registered (registration is still open!), found a place where to stay during and around the conference (still feasible!), and booked their flight to Geneva (or nearby). First, please ... [Read more...]

Buffon needled R exams

November 24, 2013 | xi'an

Here are two exercises I wrote for my R mid-term exam in Paris-Dauphine around Buffon’s needle problem. In the end, the problems sounded too long and too hard for my 3rd year students so I opted for softer questions. So recycle those if you wish (but do not ask ... [Read more...]
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