Archive for England

a marathon a day for… a year?!

Posted in Kids, Running, Travel with tags , , , , , on March 22, 2015 by xi'an

“I think a lot of people do not push themselves enough.” Rob Young

I found this Guardian article about Rob Young and his goal of running the equivalent of 400 marathons in 365 days. Meaning there are days he runs the equivalent of three marathons. Hard to believe, isn’t it?! But his terrible childhood is as hard to believe. And how cool is running with a kilt, hey?! If you want to support his donation for disadvantaged children, go to his marathon man site. Keep running, Rob!

a mad afternoon!

Posted in pictures, Running, Travel with tags , , , , , , , , , on March 21, 2015 by xi'an

An insanely exciting final day and end to the 2015 Six Nations tournament! on the first game of the afternoon, Wales beat Italy in Rome by a sound 20-61!, turning them into likely champions. But then, right after, Ireland won against Scotland 10-40! In mythical Murrayfield. A feat that made them winners unless England won over France in Twickenham by at least 26 points. Which did not happen, in a completely demented rugby game, a game of antology where England dominated but France was much more inspired (if as messy as usual) than in the past games and fought fair and well, managing to loose 35-55 and hence block English victory of the Six Nations. Which can be considered as a victory of sorts…! Absolutely brilliant ending.

Turing’s Bayesian contributions

Posted in Books, Kids, pictures, Running, Statistics, University life with tags , , , , , , , , , , , , on March 17, 2015 by xi'an

Following The Imitation Game, this recent movie about Alan Turing played by Benedict “Sherlock” Cumberbatch, been aired in French theatres, one of my colleagues in Dauphine asked me about the Bayesian contributions of Turing. I first tried to check in Sharon McGrayne‘s book, but realised it had vanished from my bookshelves, presumably lent to someone a while ago. (Please return it at your earliest convenience!) So I told him about the Bayesian principle of updating priors with data and prior probabilities with likelihood evidence in code detecting algorithms and ultimately machines at Bletchley Park… I could not got much farther than that and hence went checking on Internet for more fodder.

“Turing was one of the independent inventors of sequential analysis for which he naturally made use of the logarithm of the Bayes factor.” (p.393)

I came upon a few interesting entries but the most amazìng one was a 1979 note by I.J. Good (assistant of Turing during the War) published in Biometrika retracing the contributions of Alan Mathison Turing during the War. From those few pages, it emerges that Turing’s statistical ideas revolved around the Bayes factor that Turing used “without the qualification `Bayes’.” (p.393) He also introduced the notion of ban as a unit for the weight of evidence, in connection with the town of Banbury (UK) where specially formatted sheets of papers were printed “for carrying out an important classified process called Banburismus” (p.394). Which shows that even in 1979, Good did not dare to get into the details of Turing’s work during the War… And explains why he was testing simple statistical hypothesis against simple statistical hypothesis. Good also credits Turing for the expected weight of evidence, which is another name for the Kullback-Leibler divergence and for Shannon’s information, whom Turing would visit in the U.S. after the War. In the final sections of the note, Turing is also associated with Gini’s index, the estimation of the number of species (processed by Good from Turing’s suggestion in a 1953 Biometrika paper, that is, prior to Turing’s suicide. In fact, Good states in this paper that “a very large part of the credit for the present paper should be given to [Turing]”, p.237), and empirical Bayes.

at The X

Posted in pictures, Running, Travel, Wines with tags , , , , , , , on March 15, 2015 by xi'an


snapshot from Gibbet Hill

Posted in pictures, Travel, University life with tags , , , , on March 5, 2015 by xi'an


my week in a Tudor farmhouse

Posted in pictures, Running, Travel, University life with tags , , , , , , on February 3, 2015 by xi'an

As I could not book my “usual” maths house on the campus of the University of Warwick, I searched for another accommodation and discovered a nice shared house in the countryside (next to my standard running route), run by the Warwick Institute of Advanced Study, and called Cryfield Grange. As seen from the pictures, the building itself is impressive, even though there is not much left inside of its Tudor foundations, except some unexpected steps in the middle of some rooms and a few remaining black beams; it is also quite enjoyable for a week visit, with a large kitchen where I made rice pudding and pissaladière for the whole week, and a bike path to the University. I will definitely try to get there in the summer, as it must be even more enjoyable!


foxglove summer

Posted in Books, Kids, Travel with tags , , , , , , , , , , , on February 1, 2015 by xi'an

Here is the fifth instalment in the Peter Grant (or Rivers of London) series by Ben Aaronovitch. Thus entitled Foxglove summer, which meaning only became clear (to me) by the end of the book. I found it in my mailbox upon arrival in Warwick last Sunday. And rushed through the book during evenings, insomnia breaks and even a few breakfasts!

“It’s observable but not reliably observable. It can have a quantifiable effects, but resists any attempt to apply mathematical principles to it – no wonder Newton kept magic under wraps. It must have driven him mental. Or maybe not.” (p.297)

Either because the author has run out of ideas to centre a fifth novel on a part or aspect of London (even though the parks, including the London Zoo, were not particularly used in the previous novels), or because he could not set this new type of supernatural in a city (no spoilers!), this sequel takes place in the Western Counties, close to the Welsh border (and not so far from Brother Cadfael‘s Shrewbury!). It is also an opportunity to introduce brand new (local) characters which are enjoyable if a wee bit of a caricature! However, the inhabitants of the small village where the kidnapping investigation takes place are almost too sophisticated for Peter Grant who has to handle the enquiry all by himself, as his mentor is immobilised in London by the defection of Peter’s close colleague, Lindsey.

“We trooped off (…) down something that was not so much a path as a statistical variation in the density of the overgrowth.” (p.61)

As usual, the dialogues and monologues of Grant are the most enjoyable part of the story, along with a development of the long-in-the-coming love affair with the river goddess Beverley Brooks. And a much appreciated ambiguity in the attitude of Peter about the runaway Lindsey… The story itself reflects the limitations of a small village where one quickly repeats over and over the same trips and the same relations. Which gives a sensation of slow motion, even in the most exciting moments. The resolution of the enigma is borrowing too heavily to the fae and elves folklore, even though the final pages bring a few surprises. Nonetheless, the whole book was a page-turner for me, meaning I spent more time reading it this week than I intended or than was reasonable. No wonder for a series taking place in The Folly!


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