Archive for Bengaluru

a journal of the extremes year

Posted in Books, Kids, Mountains, pictures, Travel, Wines with tags , , , , , , , , , , , , , , , , , , , , , , , , , on December 9, 2025 by xi'an

 Read Carrying on by Stewart Tolnay, for no clear reason a posteriori! The story centres in a successful sociology senior professor in an imaginary university in Seattle (which also appears in the 1996 Sentinel), who finds himself arm-bent into becoming the new HoD and the subsequent difficulties he faces against some contrarian colleague. While this should obviously appeal to me, and despite the novel being written by a former faculty at Udub, the scenario quickly plummets down to unimaginable depths of boredom and suspension of belief. The main character is transparent, with a whining tendency and a personality as solid as a sodden marshmallow, and the other ones are almost uniformly caricatures as perfect representatives of minorities. Without getting into spoiling details, the main antagonist to this unlikely HoD conveniently accumulates all “qualities” a colleague should not possess, with an unrealistic ability to cross most of the department. More glaringly, research seems unimportant, except when applying for an NSF grant or when attending a conference where the future HoD behaves in a most unethical way imho. Add to this an endless accumulation of details about a new dog acquired by the HoD to recover from a divorce (!) and the collection of all the menus enjoyed by the HoD and his friend, and there is no compelling reason to carry on.

Also read Heart Lamp: Selected Stories, the Winner of the International Booker Prize 2025 jointly received by Banu Mushtaq, the author of the short stories in Kannada and Deepa Bhasthi, her translator into English. A beautiful, moving, profound book that builds on the everyday woes of Karnataka Muslim women to expose the wrongs of a deeply patriarchal society that denies freedom and autonomy to women. The writing style is deceptively set at a narrative level that could be found in mundane conversations, with a powerful translation, grounded in collaboration with the author, keeping some words from the original, that is prize-worthy by itself!, but may mean readers from other cultures missing some aspects of the book. In the postface, the translator Deepa Bhasthi exposes her difficulties and choices, pointing out at the differences in the Kannada versions both women speak. The Booker recognition is both definitely richly deserved for a unique piece of literature and for signaling the richness and diversity of Indian literature that Modi’s goons would like to replace by an Hindu monoculture.

A modern introduction to probability and statistics [book review]

Posted in Books, R, Statistics, Travel, University life with tags , , , , , , , , , , , , , , , , , , , , , on July 12, 2025 by xi'an

In the plane to Bengaluru, I read through the book A modern introduction to probability and statistics, by Graham Upton—whose Measuring Animal Abundance I reviewed for CHANCE a while ago—, which is based on the earlier Understanding Statistics, written jointly with Ian Cook. (Not to be confused with A modern introduction to probability and statistics by Dekking et al.) The subtitle is understanding statistical principles in the computer age. Sorry, in the age of the computer. While the cover is most pleasant (and modern), as noticed by an AF flight attendant, the contents are very very standard and could have been written decades ago since the main concession to “the” computer age is the inclusion of a few R commands at the end of most chapters. There are even a few distribution tables here and there (in case “the” computer is not available). But there is no other connection with computational statistics or statistical computing.

The classicism of the contents and the intended audience mean there is little therein on which to either object or criticise. The mixture of elementary probability and basic statistics in a single textbook always feels awkward to me and I think I would have trouble teaching solely from this material. Apart from the glaring typo on the variance of the sum of two correlated random variables on page 87, missing the factor 2 in front of the covariance, while correct(ed) p97 (and the inevitable “the the” typo spotted once). My main criticisms are on the potential confusion between samples and populations in the early chapters, when some statistics are used as motivational examples, as for instance in a (hidden) Monte Carlo stabilisation to the limiting values (p57), way before the Law of Large Numbers is introduced,, the variable mileage in mathematical rigour (while being uncertain that first year students can handle integrals and derivatives), the textbook examples, and the amount of the book contents spent on descriptive statistics and even more on the “classical” tests, with no critical perspective on using point nulls or p-values. The book concludes with a four page (benevolent) chapter on Bayesian statistics that is superfluous imho, or even counterproductive since my experience with a rushed introduction to Bayesian principles almost always result in a rejection of said principles. Plus, the illustration with the coin tossing is not particularly helpful since Andrew maintains that one can load a die, but cannot bias a coin. (A similar reservation on the half-page 289 coverage on pseudo-random generation and Monte Carlo principles for computing p-values.)

Minor (mostly idiosyncratic) remarks follow: CLT prior to LLN,   n-1 in sample sd, little to no model criticism (ntbcf goodness of fit), missing an opportunity when mentioning the varying probability of a day being a birthday (p31) in contrast with BDA cover story, and another opportunity to cite the 2024 Ig Nobel Prize for coin tossing around the LLN, an unclear definition for random variables( p53) and a potentially confusing introduction of Poisson distributions through a informal reference to Poisson processes (and no reason why the years of accession of the kings of Sussex and England till Guillaume—making a return on p178 with the Domesday Book—in 1066 should follow such a process as suggested in Figure 3.5), a surprising definition of the constant e as the special case of exp(x) when x=1 and its series expansion (p70), omitting proofs on laws of sums of iid rv’s by introducing moment generating functions rather late, another obscure reference to a 16th German treatise on surveying as a precursor of the CLT (p131), a proof for the normalising constant of the Normal density that will most likely escape most first year students, a introduction of the t, F, and χ² distributions with no mention of their respective densities (pp141-147), never defining a joint Normal distribution density, insisting on unbiasedness without noting that maximum likelihood—with a strange motivation that it “makes the next sample of n observations most likely to resemble the data in the current sample (p228)—estimators are almost always biased, an abundance of footnotes that may prove of little interest for the youngest readers.

[Disclaimer about potential self-plagiarism as usual: this post or an edited version will eventually appear in my Books Review section in CHANCE.]

A passage to India & to 2025

Posted in Kids, pictures, Running, Travel with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on January 16, 2025 by xi'an

Another great trip to India in association with the bi-yearly Winter IISA (International Indian Statistical Association) conference, including the opportunity to visit Kerala since the conference was taking place in Kochi (formerly Cochin). And a relatively smooth and relaxing trip as well! (And involuntarily repeating the Forsterite title of the earlier post.)

We left (as earlier) Paris on Xmath day, with de Gaulle airport busier than expected, including by the staff there, since a shortage of both border police officers and of luggage handlers caused a one-hour delay, with a full airplane to Bengaluru. Our flight took a rather circuitous route to avoid less secure air spaces, namely Ukraine, Israël, Syria, Iraq, and Iran, but also staying away from Houtis, hence turning sharply over the Sinaï to fly over Saudi Arabia. Massala chai onboard! My next seat neighbours sounded busy rescheduling their vacations (or others’?) to a visa-free country as some members of their party had apparently been denied boarding for that reason. (And I indeed had to frantically search through emails to recover the confirmation message from the Indian e-visa service provider at the boarding gate. But I had a great time reviewing grant proposals for most the flight!)

We were hoping for a smoother e-visa processing in Bengaluru than at our earlier visit for IISA 2022, and were indeed rewarded by no wait at all, leaving us more than five hours to switch between terminals for the leg to Kochi (and only too late realising too late there was an hotel inside the airport)! Single checked-in luggage was there at arrival in Kochi and prebooked taxi as well, to take sleep-deprived-us to a remote lodge in Mamalakkandam, at the foothill of the Western Ghats. Had some horrendous drives in this area, with small roads ill-equipped for crossing tourist buses, requiring several minutes and people directing vehicle choreographies from the pavement at times.Very relaxing stay, with tolerable temperatures, although we missed the elephants if not their multiple and fresh tracks and droppings! And managed to see a couple of Sri Lanka frogmouths, who really look like ChatGPT rendering of a chimera between a frog and a starling! And visited a small rubber farm thanks to the half-taxi-half-farming owner (with cocoa, cardamom and pepper parting gifts!).

This passage was also a foodie’s dream trip, as we discovered many new dishes, like a spicy chicken cooked in bamboo stick in an open fire and many local breads, e.g., illyappams, parathas, idlis, vellayapams, puttus, challas, and orottis, plus plenty of local dishes. Bought all kinds of spices. Celebrated New Year’s eve in Kochi by a light dinner with friends, at a local Saravana Bhavan branch that actually differed much from the one around the corner from Gare du Nord, Paris! I could not recognise most items in the menu, besides their landmark dosas and chaats, and some orders proved quite unexpected if pleasant surprises (albeit too spicy for my companions!) and was awaken a wee bit later by fireworks all over Kochi that seemed to get on forever. I could not reach a tea plantation near Munnar and further found it impossible to buy local tea, until reaching Kochi where some shops had green teas of unclear origin. It proved equally impossible to spot Munnar tea sold by reliable online tea companies.

The last station was Kuramakom, on the shores of the huge Vembanad Lake—longer than the Finger lakes surrounding Ithaca, New York—, where we saw plenty of birds as we were ferried through the backwaters at dusk. Visited the local bird sanctuary, at dawn to optimize our chances, but they remained low enough to only see a … tortoise crossing the path and a large fruit bat flying away. Day temperatures were such as making reading in the shade almost compulsory, which helped cleaning the pile of books I had taken with me.

The trip back was uneventful and reasonably delayed, considering that Delhi airport was shrouded in heavy fog and pollution, and as cold as Paris. With the incredible coïncidence of Didier Fraix-Burnet (IPAG) travelling the same flight Delhi-Paris as me, him returning from visiting Asis Chattopadhyay at the University of Calcutta—whom I visited over New Year’s Eve almost a decade ago And made it back to Paris, with our bags of groceries, with a -23⁰ temperature drop, instead of the -38⁰ drop we would have experienced a day earlier.

sunrise over Julian Alps [jatp]

Posted in Mountains, pictures, Travel with tags , , , , , , , on January 21, 2023 by xi'an

a passage to & from India

Posted in pictures, Running, Statistics, Travel, University life with tags , , , , , , , , , , , , , , , on January 10, 2023 by xi'an

Our trip from Paris (CDG) to Bengaluru got a wee bit (!) perturbed by 2x bad luck, with a first plane grounded for damages to a wing and a second plane flashing an alarm signal just as it was accelerating to take off, which induced an extra hour of tests, plus an unexpected long wait to get the e-visa at the Bengalore airport, resulting in an arrival in town at 5:30 am! A good thing that my talk was only the next day.

I was glad to be back at the (Tata) Indian Institute of Science and its wonderful campus for the IISA meeting (taking place alternately in India and in the US). The conference program was rich and with a large Bayesian component, but being sleep deprived and slightly sick did not help with my concentration during the talks… Had however nice discussions during the poster session, including one on a most unusual RJMCMC where the model-to-model transform was the identity. In a sense this voided (?) the need for RJMCMC, but it allowed for a fast & valid exploration of the different models.

Quite a contrast in my local lodging conditions, when compared with my previous visit,  since, rather than staying in the ideal visitors’ lodge located at the centre of the campus, I took the (bargain) offer (from IISA) of the nearby Sheraton (!) as the conference hotel with five star conditions, including a proper, outside, empty and non-heated swimming pool.

The (touristy) train trip to Mysore was most pleasant, on an air-conditioned carriage with food vendors proposing their wares all along the journey, great views of the countryside and an arrival sharp on time. The reverse trip to the airport was less successful as the FlyBus we took was crawling rather than flying, with heavy traffic all the way because/despite being New Year Eve’ning.  At some point, a truck carrying what looked like kindling was stuck in a pothole, blocking the highway, and a crane was brought on site to push the truck out of the hole, a strategy that surprisingly worked. But we managed to reach the airport just before midnight, when absolutely nothing happened in relation with the entry into 2023!