Posts

August 29, 2014

+
5:46 AM | Flattening things that aren't already flat
The last of my Graph Drawing preprints is also the first of the papers to see daylight from the workshop last spring in Barbados: "Flat Foldings of Plane Graphs with Prescribed Angles and Edge Lengths" (arXiv:1408.6771, with Zachary Abel, Erik Demaine, Martin Demaine, Anna Lubiw, and Ryuhei Uehara).It's part of what has become a long line of research on trying to understand which shapes can be squashed flat, starting with Maekawa's theorem (every vertex of a flat-folded sheet of paper has to […]

August 28, 2014

+
11:52 PM | When we talk about the “file drawer,” let’s not assume that an experiment can easily be characterized as producing strong, mixed, or weak results
Neil Malhotra: I thought you might be interested in our paper [the paper is by Annie Franco, Neil Malhotra, and Gabor Simonovits, and the link is to a news article by Jeffrey Mervis], forthcoming in Science, about publication bias in the social sciences given your interest and work on research transparency. Basic summary: We examined […] The post When we talk about the “file drawer,” let’s not assume that an experiment can easily be characterized as producing strong, […]
+
10:14 PM | high-dimensional stochastic simulation and optimisation in image processing [day #1]
Even though I flew through Birmingham (and had to endure the fundamental randomness of trains in Britain), I managed to reach the Even though I flew through Birmingham (and had to endure the fundamental randomness of trains in Britain), I managed to reach the “High-dimensional Stochastic Simulation and Optimisation in Image Processing” conference location (in Goldney […]
+
8:28 PM | Lontano dal pianeta silenzioso
C.S. Lewis non è solo lo scrittore de Le cronache di Narnia, ma ha anche realizzato una trilogia fantascientifica di cui recentemente (2011) la Adelphi ha proposto uno dei tre romanzi, Lontano dal pianeta silenzioso.Il protagonista, Elwin Ransom, professore di filologia, viene portato contro la sua volontà da due loschi scienziati su Marte. Sembra quasi l'incipit di Paolino Paperino e il mistero di Marte di Federico Pedrocchi, e infatti anche nel romanzo di Lewis i due rapitori […]
+
1:37 PM | Pre-election survey methodology: details from nine polling organizations, 1988 and 1992
This one from 1995 (with D. Stephen Voss and Gary King) was fun. For our “Why are American Presidential election campaign polls so variable when votes are so predictable?” project a few years earlier, Gary and I had analyzed individual-level survey responses from 60 pre-election polls that had been conducted by several different polling organizations. […] The post Pre-election survey methodology: details from nine polling organizations, 1988 and 1992 appeared first on […]
+
12:18 PM | avernian landscapes (#4)
Filed under: Mountains, pictures, Running, Travel Tagged: Auvergne, Besse-en-Chandesse, countryside, France, Puy de Sancy, Puy-de-Dôme, vacations
+
12:00 PM | In Praise of Proofs by Contradiction that Aren’t
If you don’t know what to do, do something. That’s one of my mottos when I teach math (and it’s probably good life advice too). Last year, I taught introductory analysis (basically calculus with the... -- Read more on ScientificAmerican.com
+
11:08 AM | A decision tree for decision trees
For a while now I’ve been thinking I should build a decision tree for deciding which algorithm to use on a given data project. And yes, I think it’s kind of cool that “decision tree” would be an outcome on my decision tree. Kind of like a nerd pun. I’m happy to say that I […]
+
3:15 AM | One of the worst infographics ever, but people don’t care?
This post is by Phil Price. Perhaps prompted by the ALS Ice Bucket Challenge, this infographic has been making the rounds: I think this is one of the worst I have ever seen. I don’t know where it came from, so I can’t give credit/blame where it’s due. Let’s put aside the numbers themselves – […] The post One of the worst infographics ever, but people don’t care? appeared first on Statistical Modeling, Causal Inference, and Social Science.
+
12:43 AM | A brief introduction to the logic of graphs
If you're used to writing mathematics, but haven't paid much attention to model theory, you probably think a fully-quantified mathematical sentence is generally either true or false. Fermat's last theorem, for instance, can be written as the following sentence: For all positive integers a, b, c, and n, if n > 2, then an + bn ≠ cn. This sentence is fully quantified: the four variables a, b, c, and n are all covered by the quantifier "for all positive […]

August 27, 2014

+
10:14 PM | capture-recapture homeless deaths
In the newspaper I grabbed in the corridor to my plane today (flying to Bristol to attend the SuSTaIn image processing workshop on “High-dimensional Stochastic Simulation and Optimisation in Image Processing” where I was kindly invited and most readily accepted the invitation), I found a two-page entry on estimating the number of homeless deaths using […]
+
8:31 PM | L'isola a croce e altre storie
L'isola a croceIl rapporto tra padri e figli viene approfondito, nello stesso volume della raccolta Panini, anche ne L'isola a croce, dove il dottor Tozawa evade dalla prigione in cui è rinchiuso solo per andare a completare Pook, il robot che considera un figlio e che, a causa dell'arresto, non era riuscito a finire.Se ne Il segreto dei cospiratori egiziani si approfondisce il rapporto di dipendenza tra padri e figli, in questo caso si aggiunge all'equazione anche il lato del genitore: […]
+
2:31 PM | ICM2014 — Jim Arthur plenary lecture
The main other thing I did on day two of the congress was go to a reception in the evening hosted by the French Embassy. It was less formal than that makes it sound, and as I circulated I met a number of people I hadn’t seen for quite a while, as well as others […]
+
2:05 PM | Galileo, Foscarini, The Catholic Church, and heliocentricity in 1615 Part 2 –the consequences: A Rough Guide.
In part one I outlined the clash, which took place between Galileo and Foscarini on the one side and the Catholic Church on the other in the second decade of the seventeenth-century. I ended by saying that this initial confrontation … Continue reading →
+
1:36 PM | Discussion of “A probabilistic model for the spatial distribution of party support in multiparty elections”
From 1994. I don’t have much to say about this one. The paper I was discussing (by Samuel Merrill) had already been accepted by the journal—I might even have been a referee, in which case the associate editor had decided to accept the paper over my objections—and the editor gave me the opportunity to publish […] The post Discussion of “A probabilistic model for the spatial distribution of party support in multiparty elections” appeared first on Statistical […]
+
12:32 PM | Aise O’Neil at Gotham Comedy Club
I don’t usually blog about my kids, but my 14-year-old son has explicitly given me his blessing to post his recent stand-up performance at the Gotham Comedy Club: The look he gives the audience at the end is my favorite part.
+
12:21 PM | Short
The title does not make that much sense at the beginning, but this is just because I want to make this post short, so the title is Short. I have observed a little nice thing happening: some of you have … Continue reading →
+
12:18 PM | avernian landscapes (#3)
Filed under: Mountains, pictures, Running, Travel Tagged: Auvergne, Besse-en-Chandesse, countryside, France, Puy de Sancy, Puy-de-Dôme, vacations
+
7:52 AM | Small gaps between large gaps between primes results
The big news last year was the quest to find a lower bound for the gap between pairs of large primes, started by Yitang Zhang and carried on chiefly by Terry Tao and the fresh-faced James Maynard. Now that progress on the twin prime conjecture has slowed down, they’ve both turned their attentions toward the opposite question:... Read more »
+
6:27 AM | CFP: SoTFoM II 'Competing Foundations?', 12-13 January 2015, London.
The focus of this conference is on different approaches to the foundationsof mathematics. The interaction between set-theoretic and category-theoreticfoundations has had significant philosophical impact, and represents a shiftin attitudes towards the philosophy of mathematics. This conference willbring together leading scholars in these areas to showcase contemporaryphilosophical research on different approaches to the foundations ofmathematics. To accomplish this, the conference has the […]
+
5:35 AM | Planarization by vertex deletion
Another of my Graph Drawing papers is online today: "Planar Induced Subgraphs of Sparse Graphs", arXiv:1408.5939, with Cora Borradaile and her student Pingan Zhu. It's about finding large planar subgraphs in arbitrary graphs; in the version of the problem we study, we want the planar subgraph to be an induced subgraph, so the goal is to find as large a subset of vertices as possible with the property that all edges connecting them can be drawn planarly. Equivalently, we want to delete as few […]

August 26, 2014

+
10:14 PM | dans le noir
Yesterday night, we went to a very special restaurant in down-town Paris, called “dans le noir” where meals take place in complete darkness (truly “dans le noir”!). Complete in the sense it is impossible to see one’s hand and one’s glass. The waiters are blind and the experiment turns them into our guides, as we […]
+
7:16 PM | Particle Clicker: gestire un esperimento di LHC
In particolare uno tra ATLAS e CMS, i due esperimenti giunti agli onori delle cronache per la scoperta del bosone di Higgs.E' possibile, infatti, da un paio di settimane, giocare a Particle Clicker, un bel gioco gestionale che fa comprendere quanto sia complesso, ma anche gratificante gestire un esperimento scientifico come uno dei due citati prima.Innanzitutto la schermata: è suddivisa in quattro frame. Da sinistra a destra: nel primo sono elencati i risultati di ricerca ottenuti con […]
+
4:59 PM | academic blogs: a labor of love
I recently discovered an articles about academics who blog from Tim Hitchcock (a humanities professor). The title really caught my eye: “Twitter and blogs are not add-ons to academic research, but a simple reflection of the passion that underpins it.” Yes! We don’t have to create and maintain blogs, we do so because we love our disciplines […]
+
3:31 PM | Dave Blei course on Foundations of Graphical Models
Dave Blei writes: This course is cross listed in Computer Science and Statistics at Columbia University. It is a PhD level course about applied probabilistic modeling. Loosely, it will be similar to this course. Students should have some background in probability, college-level mathematics (calculus, linear algebra), and be comfortable with computer programming. The course is […] The post Dave Blei course on Foundations of Graphical Models appeared first on Statistical Modeling, Causal […]
+
1:59 PM | ICM2014 — Barak, Guralnick, Brown
Here’s a little puzzle to get this post started. Of the fourteen 21st-century Fields medallists (if you count Perelman), seven — Lafforgue, Voevodsky, Tao, Werner, Smirnov, Avila and Mirzakhani — have something interesting in common that the others lack. What is this property? That’s a fairly easy question, so let’s follow it up with another […]
+
1:16 PM | Review of “Forecasting Elections”
From 1993. The topic of election forecasting sure gets a lot more attention than it used to! Here are some quotes from my review of that book by Michael Lewis-Beck and Tom Rice: Political scientists are aware that most voters are consistent in their preferences, and one can make a good guess just looking at […] The post Review of “Forecasting Elections” appeared first on Statistical Modeling, Causal Inference, and Social Science.
+
12:18 PM | avernian landscapes (#2)
Filed under: Mountains, pictures, Running, Travel Tagged: Auvergne, Besse-en-Chandesse, France, Puy de Sancy, Puy-de-Dôme, sunrise, vacations
+
11:20 AM | The Stubborn Hope of an Urban Teacher
Yesterday I read a book written by Carole Marshall which she called Stubborn Hope: Memoir of an Urban Teacher (thanks to Ernest Davis for sending it to me). Just to give you an idea of how quick this read is, I read it before class. I think it took about 1 hour and 10 minutes in […]

August 25, 2014

+
10:14 PM | understanding the Hastings algorithm
David Minh and Paul Minh [who wrote a 2001 Applied Probability Models] have recently arXived a paper on “understanding the Hastings algorithm”. They revert to the form of the acceptance probability suggested by Hastings (1970): where s(x,y) is a symmetric function keeping the above between 0 and 1, and q is the proposal. This obviously […]
123456789
271 Results