Archive for O’Bayes 2015

Juan Antonio Cano Sanchez (1956-2018)

Posted in Statistics, University life with tags , , , , , , , , on October 12, 2018 by xi'an

I have just learned the very sad news that Juan Antonio Cano, from Universidad de Murcia, with whom Diego Salmerón and I wrote two papers on integral priors, has passed away, after a long fight against a kidney disease. Having communicated with him recently, I am quite shocked by him passing away as I was not aware of his poor health. The last time we met was at the O’Bayes 2015 meeting in Valencià, with a long chat in the botanical gardens of the Universitat de Valencià. Juan Antonio was a very kind and unassuming person, open and friendly, with a continued flow of research in Objective Bayes methodology and in particular on integral priors. Hasta luego, Juan Antonio!

O’Bayes 2017 in Austin, Texas

Posted in pictures, Statistics, Travel, University life with tags , , , , , , , on March 30, 2016 by xi'an

The next edition of the O’Bayes conference, O’Bayes 2017, will take place at the University of Texas in Austin, with the tentative dates of Dec. 10-13. Somehow making the connection with the previous O’Bayes in Valencià thanks to its Spanish history (even though, technically, Texas was French from 1684 till 1689!!!). With a local committee made of Lizhen Lin, Tom Shively, Carlos Carvalho & Peter Müller. Further details should emerge in the coming months, but keep this objective date in your calendars! (Note that NIPS 2017 will take place in Long Beach, CA, the week before.)

O’Bayes 2015 [day #3]

Posted in Statistics, Travel, University life, Wines with tags , , , , , , , , on June 5, 2015 by xi'an

vale6The third day of the meeting was a good illustration of the diversity of the themes [says a member of the scientific committee!], from “traditional” O’Bayes talks on reference priors by the father of all reference priors (!), José Bernardo, re-examinations of expected posterior priors, on properties of Bayes factors, or on new versions of the Lindley-Jeffreys paradox, to the radically different approach of Simpson et al. presented by Håvard Rue. I was obviously most interested in posterior expected priors!, with the new notion brought in by Dimitris Fouskakis, Ioannis Ntzoufras and David Draper of a lower impact of the minimal sample on the resulting prior by the trick of a lower (than one) power of the likelihood. Since this change seemed to go beyond the “minimal” in minimal sample size, I am somehow puzzled that this can be achieved, but the normal example shows this is indeed possible. The next difficulty is then in calibrating this power as I do not see any intuitive justification in a specific power. The central talk of the day was in my opinion Håvard’s as it challenged most tenets of the Objective Bayes approach, presented in a most eager tone, even though it did not generate particularly heated comments from the audience. I have already discussed here an earlier version of this paper and I keep on thinking this proposal for PC priors is a major breakthrough in the way we envision priors and their derivation. I was thus sorry to hear the paper had not been selected as a Read Paper by the Royal Statistical Society, as it would have nicely suited an open discussion, but I hope it will find another outlet that allows for a discussion! As an aside, Håvard discussed the case of a Student’s t degree of freedom as particularly challenging for prior construction, albeit I would have analysed the problem using instead a model choice perspective (on an usually continuous space of models).

montanaAs this conference day had a free evening, I took the tram with friends to the town beach and we had a fantastic [if hurried] dinner in a small bodega [away from the uninspiring beach front] called Casa Montaña, a place decorated with huge barrels, offering amazing tapas and wines, a perfect finale to my Spanish trip. Too bad we had to vacate the dinner room for the next batch of customers…

virgulilla