Archive for Tony O’Hagan

Bureau international des poids et mesures

Posted in Books, Statistics, University life with tags , , , , , , , , , , on June 15, 2015 by xi'an

Today, I am taking part in a meeting in Paris, for an exotic change!, at the Bureau international des poids et mesures (BIPM), which looks after a universal reference for measurements. For instance, here is its definition of the kilogram:

The unit of mass, the kilogram, is the mass of the international prototype of the kilogram kept in air under three bell jars at the BIPM. It is a cylinder made of an alloy for which the mass fraction of platinum is 90 % and the mass fraction of iridium is 10 %.

And the BIPM is thus interested in the uncertainty associated with such measurements. Hence the workshop on measurement uncertainties. Tony O’Hagan will also be giving a talk in a session that opposes frequentist and Bayesian approaches, even though I decided to introduce ABC as it seems to me to be a natural notion for measurement problems (as far as I can tell from my prior on measurement problems).

a week in Warwick

Posted in Books, Kids, Running, Statistics, University life with tags , , , , , , , , , , , , on October 19, 2014 by xi'an

Canadian geese, WarwickThis past week in Warwick has been quite enjoyable and profitable, from staying once again in a math house, to taking advantage of the new bike, to having several long discussions on several prospective and exciting projects, to meeting with some of the new postdocs and visitors, to attending Tony O’Hagan’s talk on “wrong models”. And then having Simo Särkkä who was visiting Warwick this week discussing his paper with me. And Chris Oates doing the same with his recent arXival with Mark Girolami and Nicolas Chopin (soon to be commented, of course!). And managing to run in dry conditions despite the heavy rains (but in pitch dark as sunrise is now quite late, with the help of a headlamp and the beauty of a countryside starry sky). I also evaluated several students’ projects, two of which led me to wonder when using RJMCMC was appropriate in comparing two models. In addition, I also eloped one evening to visit old (1977!) friends in Northern Birmingham, despite fairly dire London Midlands performances between Coventry and Birmingham New Street, the only redeeming feature being that the connecting train there was also late by one hour! (Not mentioning the weirdest taxi-driver ever on my way back, trying to get my opinion on whether or not he should have an affair… which at least kept me awake the whole trip!) Definitely looking forward my next trip there at the end of November.

Dennis Lindley and Tony O’Hagan on YouTube

Posted in Statistics, University life with tags , , , on August 20, 2013 by xi'an

The great discussion Tony O’Hagan had with Dennis Lindley last March for the Bayes 250 meeting at the RSS is now available on line.

Since this is still close to Dennis’s birthday, I take the opportunity to wish him the best for his 90th birthday.