Archive for WW II

a journal of the [second] plague year

Posted in Books, Kids, pictures, Travel, University life with tags , , , , , , , , , , , , , , , , , , , , , , , on April 10, 2021 by xi'an

Read the picaresque El Buscòn (in French, translated by Nicolas Restif de La Bretonne), dating from 1602-1604, but the classic French translation from a century later is quite enjoyable and the story often hilarious. (I read this book after reading in 2019 the BD (comics) by Alain Ayroles and Juanjo Guarnido called les Indes Fourbes, that was inspired from El Buscòn and pretended to produce its sequel, located in South America). Also read the second volume of Olen Steinhauer, The Confession, just as impressive a dig into the minutiae of a Balkanic socialist dictature as the first one. And into the complex mind of another militia inspector in the homicide squad. (Just wondering if there were truly paper cups in the post-war Eastern block!)

Made my first fresh pastas with the traditional pasta machine my daughter got me as a Xmas present! I need improvements but, despite the mess this creates (flour everywhere!), it is a real treat to eat fresh pastas. The next goal is to check if soba noodles can be made with the machine….

Watched some parts of a rather terrible Korean series, Demon Catchers (or The Uncanny Counter). With absolutely no redeeming feature, although a very popular show… And the beginning episodes of another SF Korean series, Alice,  playing with time travel themes until it hit the usual paradoxes. (At least the physics fomulae on the white boards sounded correct, even though the grossly romanticised home office of a physics professor made no sense.)

Gave up on Augusto Cruz’ London after Midnight. Which revolves around the search for a surviving copy of the 1927 horror movie London after midnight, made by Tod Browning, and seemingly cursed. The plot is terrible and the style awful, an unpalatable endless infodump… Read P. Djeli Clark’s delightful short story A Dead Djinn in Cairo, which is a prequel to Haunting of tramcar 105 about a supernatural Cairo in the early 1900’s.

Alain Turing cash!

Posted in pictures, Travel with tags , , , , , , , , , , , on April 8, 2021 by xi'an

a journal of the plague year [grey & dry ‘nuary reviews]

Posted in Books, Kids, pictures, Travel with tags , , , , , , , , , , , , , , , , , , , , , , , , , , on February 27, 2021 by xi'an

Read a Danish novel Ø by Siri Ranva Hjelm Jacobsen, directly translated as island in other languages (incl. French), which was a b’day gift from my wife, a book about the longing of uprooted Faroeses for their island,  rather than about the mathematical meaning of the empty set!, and the connection between a young third generation young woman and her grand-mother’s story. Very well written, with a side entry on Faroese recent history, incl. the British occupation during WWII, just before they invaded Iceland. (And feeding my hopes to visit the Faroe in a near and brighter future!)

Cooked more (Flemmish) red and (curried) white cabbage. Moved to baking spelt bread with spelt yeast as it takes less than ten minutes of actual work!  Attempted an Ethiopian meal with key wat (beef) stew,  a vegetable version, and injera (pancakes) when I realised the teff cereal could be replaced with buckwheat, a basic staple in Breton households! But the injera tasted and looked more like a galette, so this was not the real thing… Nonetheless a nice family meal.Watched the second instalment of The Hundred-Year-Old Man Who Climbed Out of the Window and Disappeared, The 101-Year-Old Man Who Skipped Out on the Bill and Disappeared, which is the straight continuation of the former if not as funny. (And not directly linked to the books.)

Read Time of Contempt, second volume in the Witcher’s novels. Not particularly impressive, with a lot of infodump chitchat, an almost absent Yennefer, a (thankfully short-lived) threat of the return of the magicians’ boarding school!, a gratuitous (?) visit by the Wild Hunt myth, some Star War inspired monster, an incomprehensible and highly predictable coup on the magicians’ council, and a teenage gang (in a Mark Lawrence rewriting Lord of the Flies spirit!), an inexplicable collapse of the balance of powers between the kingdoms. And I found the rendering of the rape scene at the end of the book most disturbing…

Bayesian sufficiency

Posted in Books, Kids, Statistics with tags , , , , , , , , , on February 12, 2021 by xi'an

“During the past seven decades, an astonishingly large amount of effort and ingenuity has gone into the search fpr resonable answers to this question.” D. Basu

Induced by a vaguely related question on X validated, I re-read Basu’s 1977 great JASA paper on the elimination of nuisance parameters. Besides the limitations of competing definitions of conditional, partial, marginal sufficiency for the parameter of interest,  Basu discusses various notions of Bayesian (partial) sufficiency.

“After a long journey through a forest of confusing ideas and examples, we seem to have lost our way.” D. Basu

Starting with Kolmogorov’s idea (published during WW II) to impose to all marginal posteriors on the parameter of interest θ to only depend on a statistic S(x). But having to hold for all priors cancels the notion as the statistic need be sufficient jointly for θ and σ, as shown by Hájek in the early 1960’s. Following this attempt, Raiffa and Schlaifer then introduced a more restricted class of priors, namely where nuisance and interest are a priori independent. In which case a conditional factorisation theorem is a sufficient (!) condition for this Q-sufficiency.  But not necessary as shown by the N(θ·σ, 1) counter-example (when σ=±1 and θ>0). [When the prior on σ is uniform, the absolute average is Q-sufficient but is this a positive feature?] This choice of prior separation is somewhat perplexing in that it does not hold under reparameterisation.

Basu ends up with three challenges, including the multinomial M(θ·σ,½(1-θ)·(1+σ),½(1+θ)·(1-σ)), with (n¹,n²,n³) as a minimal sufficient statistic. And the joint observation of an Exponential Exp(θ) translated by σ and of an Exponential Exp(σ) translated by -θ, where the prior on σ gets eliminated in the marginal on θ.

brutally sent to Coventry

Posted in Books, Kids, pictures, Travel, University life with tags , , , , , , , , , , on February 7, 2021 by xi'an

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