Archive for bike

Structure and uncertainty, Bristol, Sept. 24-27

Posted in pictures, Running, Statistics, Travel, University life with tags , , , , , , , , , on September 25, 2012 by xi'an

I am back in Bristol just a few months after an earlier SuSTain workshop. (During my Spring UK trip to Bristol, Glasgow, and Edinburgh…) The theme of the workshop is Structure and uncertainty modelling, inference and computation in complex stochastic systems. And it enjoys a very rich program over the four days! I am talking about ABC and empirical likelihood, with the following slides I just completed:

Unsurprisingly, those slides borrow both from my earlier talks in Kyoto and Australia, and from Pierre Purdlo’s earlier talk on this paper… (I also added pictures of some of the hikes and climbs Peter Green and I survived together!)

I alas arrived too late for today’s sessions, having to give the opening lecture at my Statistics Master in Paris-Dauphine. (I will also alas miss half of Thursday’s talks!) As I am staying at the Avon Gorge Hotel, just next to the bridge, I took the opportunity of some remaining daylight to go running across Brunel’s bridge and into the nearby park of Leigh Woods. It happened to be very muddy thanks to the torrential rains of the morning, but it was a good way to test my recovering knee (after a minor bike fall last week!) on a long run… And it apparently held, although tomorrow morning run will tell for sure.

big bang/data/computers

Posted in Running, Statistics, University life with tags , , , , , , , , , on September 21, 2012 by xi'an

I missed this astrostatistics conference announcement (and the conference itself, obviously!), occurring next door… Actually, I would have had (wee) trouble getting there as I was (and am) mostly stuck at home with a bruised knee and a doctor ban on any exercise in the coming day, thanks to a bike fall last Monday! (One of my 1991 bike pedals broke as I was climbing a steep slope and I did not react fast enough… Just at the right time to ruin my training preparation of the Argentan half-marathon. Again.) Too bad because there was a lot of talks that were of interest to me!

One bicycle for two

Posted in R, Running with tags , , on March 23, 2011 by xi'an

Robin showed me a mathematical puzzle today that reminded me of a story my grand-father used to tell. When he was young, he and his cousin were working in the same place and on Sundays they used to visit my great-grand-mother in another village. However, they only had one bicycle between them, so they would share the bicyle by alternating walking and cycling episodes, every 200 meters or so! Robin’s problem is to find the optimal portions of the distance spent by each of both cousins on the bicycle if one knows their respective walking and cycling speeds.

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A series of mechanical mishaps

Posted in Running with tags , , , , , , , on March 7, 2011 by xi'an

The past week saw the coincidence of a series of mechanical problems on the home front:

  • I was diagnosed with a meniscus tear after an MRI, presumably due to years of jogging although it only started to feel painful after Adap’skiii…. This was treated by an cortisone injection in the knee (addressing the inflammation hopefully for a few years but not the tear).
  • My bike back-wheel axis broke, which means I biked back home with the brake on! Good training! (And it does not hurt the knee!) Changing this wheel will cost me the equivalent of a full tank of gas, i.e. at least forty round trips to my office…
  • My Macbook video card broke down on Monday night, meaning truly no access to the data even with an external screen. (I wonder if this is yet another effect of the Philadelphia tea party!) Fortunately, this was right after my weekend backup so only a day of work on the Jaynes‘ slides is inaccessible. Fortunately too, the newer Macbook was already equipped with Kubuntu 10.10 and the switch was easy, except for having to use a mouse for the first time in ten years! As reported in this earlier post, the system works almost perfectly, with only the microphone and the wireless mouse not operational… If I could use the touch-pad for cut&paste, it would be perfect. Anyway, I should get my 2007 Macbook early this week with a new video card, courtesy of Apple despite the warranty having run out!
  • My radio stopped broadcasting the national public radio on Saturday evening for about half an hour. I found only the next day that this was due to an incredible…series of coincidences and accidents at the national public radio that stopped all broadcasting for half an hour! Nothing related with my own radio then.
  • My car thermometer started giving impossibly low temperatures, by a factor of -10⁰C or so… This is a very minor bug and an interesting calibration problem: I will try to check whether the discrepancy is reliable enough to build a correcting function!