Archive for RSS

a somewhat hasty announcement

Posted in Books, Statistics, University life with tags , , , , , on March 13, 2017 by xi'an

When I received the above RSS newsletter on Thursday, I was a bit shocked as I had not planned to make the existence of the Series B’log known to the entire Society. Even though it was already visible and with unrestricted access. The reason being that experimenting with authors and editors was easier without additional email and password exchanges…

Anyway, now that we have jumped that Rubicon, I would more than welcome comments and suggestions to make the blog structure more efficient and readable. I am still confused as to how the front page should look like, because I want to keep the hierarchy of the Journal, i.e., volume/issue/paper, reflected in this structure, rather than piling up comments and authors’ summaries in an haphazard manner. I have started to tag entries by the volume/issue tag, in order to keep some of this hierarchy respected but I would like to also provide all entries related to a given paper without getting into much extra-work. Given that I already have to process most entries through latex2wp in the best scenario.

RSS 2017 in Glasgow

Posted in Mountains, pictures, Statistics, Travel, University life with tags , , , on March 10, 2017 by xi'an

the end of Series B!

Posted in Books, pictures, Statistics, University life with tags , , , , on May 25, 2016 by xi'an

I received this news from the RSS today that all the RSS journals are turning 100% electronic. No paper version any longer! I deeply regret this move on which, as an RSS member, I would have appreciated to be consulted as I find much easier to browse through the current issue when it arrives in my mailbox, rather than being t best reminded by an email that I will most likely ignore and erase. And as I consider the production of the journals the prime goal of the Royal Statistical Society. And as I read that only 25% of the members had opted so far for the electronic format, which does not sound to me like a majority. In addition, moving to electronic-only journals does not bring the perks one would expect from electronic journals:

  • no bonuses like supplementary material, code, open or edited comments
  • no reduction in the subscription rate of the journals and penalty fees if one still wants a paper version, which amounts to a massive increase in the subscription price
  • no disengagement from the commercial publisher, whose role become even less relevant
  • no access to the issues of the years one has paid for, once one stops subscribing.

“The benefits of electronic publishing include: faster publishing speeds; increased content; instant access from a range of electronic devices; additional functionality; and of course, environmental sustainability.”

The move is sold with typical marketing noise. But I do not buy it: publishing speeds will remain the same as driven by the reviewing part, I do not see where the contents are increased, and I cannot seriously read a journal article from my phone, so this range of electronic devices remains a gadget. Not happy!

RSS statistical analytics challenge 2014

Posted in Kids, R, Statistics, University life, Wines with tags , , , , on May 2, 2014 by xi'an

RSS_Challenge_2014Great news! The RSS is setting a data analysis challenge this year, sponsored by the Young Statisticians Section and Research Section of the Royal Statistical Society: Details are available on the wordpress website of the Challenge. Registration is open and the Challenge goes live on Tuesday 6 May 2014 for an exciting 6 weeks competition. (A wee bit of an unfortunate timing for those of us considering submitting a paper to NIPS!) Truly terrific, I have been looking for this kind of event to happen for many years (without finding the momentum to set it rolling…)  and hope it will generate a lot of exciting activity and replicas in other societies.

chain event graphs [RSS Midlands seminar]

Posted in pictures, Statistics, University life with tags , , , , , , , , , , on October 16, 2013 by xi'an

img_1836Last evening, I attended the RSS Midlands seminar here in Warwick. The theme was chain event graphs (CEG), As I knew nothing about them, it was worth my time listening to both speakers and discussing with Jim Smith afterwards. CEGs are extensions of Bayes nets with originally many more nodes since they start with the probability tree involving all modalities of all variables. Intensive Bayesian model comparison is then used to reduce the number of nodes by merging modalities having the same children or removing variables with no impact on the variable of interest. So this is not exactly a new Bayes net based on modality dummies as nodes (my original question). This is quite interesting, esp. in the first talk illustration of using missing value indicators as a supplementary variable (to determine whether or not data is missing at random). I also wonder how much of a connection there is with variable length Markov chains (either as a model or as a way to prune the tree). A last vague idea is a potential connection with lumpable Markov chains, a concept I learned from Kemeny & Snell (1960): a finite Markov chain is lumpable if by merging two or more of its states it remains a Markov chain. I do not know if this has ever been studied from a statistical point of view, i.e. testing for lumpability, but this sounds related to the idea of merging modalities of some variables in the probability tree…

RSS conference in Newcastle

Posted in Books, pictures, Running, Statistics, Travel, University life with tags , , , , , , , on September 5, 2013 by xi'an

IMG_1697Although I could not stay at the RSS Annual Conference for the three days, I would have liked to do so, as there were several interesting sessions, from MCMC talks by Axel Finke, Din-Houn Lau, Anthony Lee and Michael Betancourt, to the session on Anti-fragility, the concept produced by Nassim Taleb in his latest book (reviewed before completion by Larry Wasserman). I find it rather surprising that the RSS is dedicating a whole session to this, but the usually anti-statistic stance of Taleb (esp. in The Black Swan) may explain for it (and the equally surprising debate between a “pro-Taleb” and a “pro-Silver”. I will also miss Sharon McGrayne‘s talk on the Bayesian revolution, but look forward to hear it at the Bayes-250 day in Duke next December. And I could have certainly benefited from the training session about building a package in R. It seemed, however, that one-day attendance was a choice made by many participants to the conference, judging from the ability to register for one or two days and from the (biased) sample of my friends.

Incidentally, the conference gave me the opportunity to discover Newcastle and Tynemouth, enjoying the architecture of Grey Street and running on the huge meadows almost at the city centre, among herds of cows in the morning fog. (I wish I had had more time to reach the neighbourly Hadrian wall and Durham, that I only spotted from the train to B’ham!)

re-read paper

Posted in Books, Statistics, Travel, University life with tags , , , , , , , on September 3, 2013 by xi'an

Today, I attended the RSS Annual Conference in Newcastle-upon-Tyne. For one thing, I ran a Memorial session in memory of George Casella, with my (and his) friends Jim Hobert and Elias Moreno as speakers. (The session was well-attended if not overwhelmingly so.) For another thing, the RSS decided to have the DIC Read Paper by David Spiegelhalter, Nicky Best, Brad Carlin and Angelika van der Linde Bayesian measures of model complexity and fit re-Read, and I was asked to re-discuss the 2002 paper. Here are the slides of my discussion, borrowing from the 2006 Bayesian Analysis paper with Gilles Celeux, Florence Forbes, and Mike Titterington where we examined eight different versions of DIC for mixture models. (I refrained from using the title “snow white and the seven DICs” for a slide…) I also borrowed from our recent discussion of Murray Aitkin’s (2009) book. The other discussant was Elias Moreno, who focussed on consistency issues. (More on this and David Spiegelhalter’s defence in a few posts!) This was the first time I was giving a talk on a basketball court (I once gave an exam there!)