X

+

Jerome let me know of a few postdoc/PhD/internship opportunities in his lab, here they are:Stages“Sparse blind source separation from multichannel Poisson measurements”, deadline 29/02/2016“Algorithms for solving large-scale blind-source separation problems”, deadline 29/02/2016“Polarimetric imaging by compressive sensing", deadline 29/02/2016“Learning non-linear sparse signal models", deadline 29/02/2016“Multidimensional dictionary learning for polarized data", deadline
[…]

+

9:30 AM | Happy Black Friday

I got up at four in the morning just to get a drop on all of the other Black Friday bloggers.

+

8:25 AM | Serious tongue-twister

This is a flow-chart I put together, that may go in the documentation for the Health Research Council data monitoring committee. Obviously the questions in boxes are simplified and would need expansion in the text.Most of the work of the data monitoring committee, and the work that the study does on our behalf, is concentrated at the twice-yearly meetings. Some things, though, can’t safely be left to accumulate for six months, so there’s urgent reporting of sufficiently noteworthy clinical
[…]

+

Q: This Herald photo caption says “Men with facial hair showed much higher levels of hostile sexism, the study found.” Did it? A: No. Q: Ok, how about the introduction “Bearded men will just have to take it on the chin – they are, apparently, more sexist.”? A: Not really. Q: <sigh> Was this mice again? A: […]

+

10:37 PM | What should data use agreements look like?

After the news about Jarrod Gilbert being refused access to crime data, it’s worth looking at what data-use agreements should look like. I’m going to just consider agreements to use data for one’s own research — consulting projects and commissioned reports are different. On Stuff, the police said “Police reserves the right to discuss research […]

+

7:12 PM | MPM2D - Day 54: Factoring, Day 2

The algebra tiles were waiting on students' desks as they walked in this morning, but as we had not finished what we started yesterday, the tiles had to wait. My students were not impressed with common factoring binomials. Even with pumpkins and happy faces.And then I really made things worse with this:We did a little work on the whiteboard to try to figure out how to deal with this case. They game me numbers, we worked out x - y and y - x. We talked about what was the same and what was
[…]

+

Richard Barker points us to an update on ipredict, the New Zealand political prediction market. From the news article by Hamish Rutherford: The site, run by Victoria University of Wellington’s commercialisation arm, VicLink, issued a statement to its website and on Twitter on Thursday. According to the iPredict statement, Associate Justice Minister Simon Bridges refused […]
The post “iPredict to close after Govt refuses anti-money laundering law exemption” appeared first
[…]

+

2:24 PM | 오키나와 호텔 나하 레드플래닛 저렴한 호텔 숙박후기

여기서는 저렴한 오키나와 호텔 나하 레드플래닛 호텔을 리뷰한다. 나하시내 오키나와 호텔 중에서 나하 레드플래닛 호텔은 굉장히 저렴하면서 깔끔한 디자인의 비지니스 호텔이다. 보통 한국에서 비지니스 호텔하면 뭔가 우중충한 이미지가 연상되는데, 나하 레드플래닛 호텔 (Naha Red Planet Hotel)은 외관과 호텔 내부 디자인에 … Continue reading →

+

If you watch this and you could swear you remember Johnny and Mr. Carlson discussing Pink Floyd, you're not imagining things. Hulu uses the DVD edit which cuts out almost all of the copyrighted music. . As for my favorite line, it comes from the Buffy episode "Pangs" and it requires a bit of a set up (which is a pain because it makes it next to impossible to work into a conversation).Buffy's luckless friend Xander had accidentally violated a native American grave yard and, in addition to […]

+

9:28 PM | Boston Stan meetup 1 Dec

Here’s the announcement: Using Stan for variational inference, plus a couple lightning talks Dustin Tran will give a talk on using Stan for variational inference, then we’ll have a couple lightening (5 minute-ish) talks on projects. David Sparks will talk, I will talk about some of my work and we’re looking for 1-2 more volunteers. […]
The post Boston Stan meetup 1 Dec appeared first on Statistical Modeling, Causal Inference, and Social Science.

+

7:36 PM | I am Battling Ladybugs This Year

We have had a warm winter in Minnesota so far this year. As with every transition from fall to winter, bugs seek warmth by taking up residence in our fiber-optic enclosures. Here is my latest example, a ladybug on a returned circuit board. Continue reading →

+

7:30 PM | Potluck Math

I was talking to one of my co-workers about a “Friendsgiving” she is holding, and how the food bill is getting up there as more people are invited. But some of those people are also bringing food – and everyone is worried about having enough. I realized this is a very common problem with potluck […]

+

References: Amitabha Lahiri & P. B. Pal, A First Book of Quantum Field Theory, Second Edition (Alpha Science International, 2004) – Chapter 1, Problem 1.7. We can summarize the electromagnetic field in tensor form by means of the field tensor [This tensor is written using relativistic units with so that and have the same dimensions.] […]

+

5:36 PM | MPM2D - Day 53: Common Factoring

Students arrived to find this on their desks.A version of this has been floating around Twitter lately and I thought it would be a good way to get them thinking about common factoring and would lead us to finding the greatest common factor. Here are some of what they came up with for parts (h), (e) and (g) (ignore the simplification of x^5 over x^2 in the middle!). I asked them why my version was "better" (I showed them all my questions which are also at the top of each column, below). Someone
[…]

+

5:13 PM | Regime Shift?

I just read an interesting paper about a ‘regime shift’ in the Earth’s biophysical systems that may have happened around 1987: • Philip C. Reid et al, Global impacts of the 1980s regime shift on the Earth’s climate and systems, Global Change Biology, 2015. There’s no reason that the climate needs to change gradually. Recently […]

+

Leslie just mentioned to me that of he and his colleague's foray into deep learning. Here it is:Gradual DropIn of Layers to Train Very Deep Neural Networks by Leslie N. Smith, Emily M. Hand, Timothy DosterWe introduce the concept of dynamically growing a neural network during training. In particular, an untrainable deep network starts as a trainable shallow network and newly added layers are slowly, organically added during training, thereby increasing the network's depth. This is accomplished
[…]

+

2:50 PM | 츄라우미 수족관 ~ 오키나와 여행 6

오키나와 여행에서 빼 놓을 수 없는 곳이 바로 츄라우미 수족관 ! 오키나와 나비공원을 들렀다가 다시 관광 버스를 탑승하고 나비공원 인근에 위치한 츄라우미 수족관으로 향했다. 츄라우미 수족관 영업시간은 오전 8시부터 오후 9시까지… 수족관 치고 굉장히 늦게까지 문을 열어 놓는다. 여기는 돌고래 … Continue reading →

+

In response to some of the discussion that inspired yesterday’s post, Gary McClelland writes: I remain convinced that discretizing a continuous variable, especially for multiple regression, is the road to perdition. Here I explain my concerns. First, I don’t buy the motivation that discretized analyses are easier to explain to lay citizens and the press. […]
The post Gary McClelland agrees with me that dichotomizing continuous variable is a bad idea. He also thinks my suggestion
[…]

+

[In case you missed the naked emperor thread up until now, click here, here and here.]As mentioned before, the establishment press, as always best represented by the New York Times, is on the horns of a dilemma. The thought of Donald Trump getting the Republican nomination for president is unthinkable for any number of reasons. Unfortunately however, virtually all of Trump's abuses and his most offensive tactics were made possible by years of declining journalistic standards at the very same […]

+

If you recall, dear reader, around this time last year, Robert Vander Velde, David Basanta, Jacob Scott and I got excited about the Archetti (2013,2014) approach to modeling non-linear public goods in cancer. We’ve been working on this intermittently for the last year, but aim to focus now that I have settled in here at […]

+

3:30 AM | What do statisticians do all day?

The New Zealand Statistical Association is having its annual meeting at the moment in Christchurch. It’s hard for a lot of people to imagine how there could be new research in statistics, so here are some examples from the awards. Maxine Pfannkuch won the Association’s lifetime achievement award, for her work on statistics education. She studies how […]

+

10:49 PM | Congratulations, Dr. Lam!

Jenny Lam, my teaching assistant for algorithms this quarter, passed today her thesis defense. She has been working with Sandy Irani, primarily on online algorithms for replacement and memory management strategies in heterogeneous caches (such as web proxies that have to maintain copies of documents of widely varying sizes), and has three papers on that subject, one at ALENEX and two at Middleware. She also has another paper on security-related algorithms in submission, which I'm also a […]

+

8:52 PM | Bateman on the Turkey/Russia standoff

Like I said before, if you want an informed opinion...

+

8:40 PM | This can be done much better

Counter example of how to present a model in a paper: I suspect the reason why x1,x2,… are used as that this is the way models are presented in some textbooks.

+

8:31 PM | Internet use and religion, part four

In the previous article, I presented preliminary results from a study of relationships between Internet use and religion. Using data from the European Social Survey, I ran regressions to estimate the effect of media consumption (television, radio, newspapers, and Internet) on religious affiliation and degree of religiosity.As control variables, I include year born, education and income (expressed as relative ranks within each country) and the year the data were gathered (between 2002 and […]

+

7:19 PM | MPM2D - Day 52: Back to Word Problems

I had today's lesson all planned out. We were going to formally start factoring (they have been factoring in their homework for weeks) and then I checked yesterday's homework on solving distance-rate-time systems questions. Only 13 out of 27 students handed their homework in and, of those, only 6 seemed to truly understand it. The previous day's part of the homework dealing with mixture problems had similar results. It was clear that it was important to stop and help them better understand
[…]

+

Jarrod Gilbert has spent a lot of time hanging out with people in biker gangs. That’s how he wrote his book, Patched, a history of gangs in New Zealand. According to the Herald, it’s also the police’s rationale for not letting him have access to crime data. I don’t know whether it would be more charitable to the Police […]

+

5:56 PM | Blind and reference-free fluorescence lifetime estimation via consumer time-of-flight sensors

Ayush just sent me the following: Hi Igor: I have been an avid follower of you blog since time immemorial. ;) I am not sure if the content of this email is interesting for your blog but given your recent discussion on computational imaging, I would like to bring to your notice a recent paper of ours that appeared in the latest volume of Optica. The theme of this paper is to show that Kinect-like Time-of-Flight sensors can be used for purposes that go beyond conventional depth imaging. The
[…]

+

Carol Nickerson pointed me to a series of papers in the journal Consumer Psychology, first one by Dawn Iacobucci et al. arguing in favor of the “median split” (replacing a continuous variable by a 0/1 variable split at the median) “to facilitate analytic ease and communication clarity,” then a response by Gary McClelland et al. […]
The post Beyond the median split: Splitting a predictor into 3 parts appeared first on Statistical Modeling, Causal Inference, and
[…]

+

We've already started a thread on the conservative media establishment actually being primarily partisan rather than ideologically conservative, resulting in, among other things, sharp turns on various issues when partisan interests shift. I've also been meaning to start a thread on the effects of feeding your party core a steady stream, not just of lies but of mutually contradictory misinformation. I'd argue that, to understand the Tea Party, you have to consider the […]

Sidebar

Filters

+

di diffusione della scienza e rivoluzioni cc @aubreymcfato @CristianCantoro Utilizzare i dati sulle citazioni in Wikipedia per misurare la diffusione dell'open accessScrivevo all'inizio del 2011 per i festeggiamenti del wiki-decennale di una rivoluzione irreversibile. E' stato piuttosto interessante leggere il titolo che technology review ha utilizzato per raccontare dell'ultimo degli articoli dedicati all'enciclopedia libera: Why Wikipedia + Open Access = Revolution.L'idea degli autori, Misha
[…]

Nielsen, F. (2007). Scientific citations in Wikipedia, First Monday, 12 (8) DOI: 10.5210/fm.v12i8.1997

Heather Ford, Shilad Sen, David R. Musicant & Nathaniel Miller (2013). Getting to the source: where does Wikipedia get its information from?, Proceedings of the 9th International Symposium on Open Collaboration, DOI: 10.1145/2491055.2491064

Misha Teplitskiy, Grace Lu & Eamon Duede (2015). Amplifying the Impact of Open Access: Wikipedia and the Diffusion of Science, Wikipedia Workshop at 9th International Conference on Web and Social Media (ICWSM), arXiv: 1506.07608v1

Citation

+

After (or before?) @StartsWithABang's balloon animals' post? A couple of week ago Ethan Siegel published a post about ballon animals, so I decide to repost an old piece that I wrote in 2011 for my italian blog: the english version is lost, but it is magically reposted here! Two one-balloon constructions and their associated graphsI recently discovered this interesting site, vihart. In the site there are some interesting paper and today I want to write something about Computational Balloon
[…]

Demaine E.D., Demaine M.L. & Hart V. (2008). Computational balloon twisting: The theory of balloon polyhedra., Proceedings of the 20th Canadian Conference on Computational Geometry (CCCG2008), 139-142.

Bryś K. & Lonc Z. (2009). Polynomial cases of graph decomposition: A complete solution of Holyer's problem, Discrete Mathematics, 309 (6) 1294-1326. DOI: 10.1016/j.disc.2008.01.054

Citation

+

Supponiamo di doverci confrontare con un animale, ad esempio un cane o un lupo (o più in generale con un animale, addomesticato o selvaggio). Secondo Konrad Lorenz il comportamento aggressivo di un cane viene influenzato da due stati d'animo differenti: l'ira e la paura.Si può allora provare a prevedere il comportamento del cane in funzione di quale dei due stati domina: nel caso in cui l'animale è dominato da paura o da ira, proporre una previsione è abbastanza semplice; nel caso in cui il […]

Zeeman E.C. (1976). Catastrophe Theory, Scientific American, 234 65-83. DOI: 10.1038/scientificamerican0476-65

Jean Petitot (2013). Complexity and self-organization in Turing, The Legacy of A.M. Turing, (E. Agazzi, ed.), Franco Angeli, Milano, 149-182. arXiv: 1502.05328v1

Citation

+

Non prevedevo di scrivere la versione italiana di un post sull'ultima news proveniente dal RHIC, ma mi è stato gentilmente chiesto, e provvedo ben volentieri. Inizio, però, con un piccolo cappello, alla fine del quale saprete che c'è anche un piccolissimo pezzetto (il doppio diminutivo è perché i firmatari del papero su arXiv sono veramente tanti) d'Italia in questa interessante scoperta.Tutto nasce da un post, nel flusso twittero, di Annalisa Arci, in cui racconta, in maniera e con un […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv, arXiv: 1504.02175v2

Citation

+

A new clue about the #quarkgluonplasma from @RHIC_STAR at @BrookhavenLabWithin the particles that constitute atomic nuclei, protons and neutrons, there are the quarks, the elementary particles with fractional charges, linked to each other thanks to the gluons, bosons that carry the nuclear interaction. Thanks to the gluons it is impossible to observe, at present, free quarks, but it is expected that in the very first stage of the universe, matter was in a state called quark-gluon plasma. Thanks […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv: 1504.02175v2

Citation

MathFour tweeted: @MathFour

Live more, complain less.
More smiles, less stress.
Less hate, more blessed.
- David Roads #quote

2015-11-27 20:17:23

michiexile tweeted: @michiexile

RT @radicalbytes: Here’s a tweet sure to make me super popular!
The geek guy obsession with superheroes is connected to fetishizing toxic …

2015-11-27 20:09:29

michiexile tweeted: @michiexile

RT @radicalbytes: At some point we really need to start taking media seriously in terms of what it's teaching all of us about manhood and m…

2015-11-27 20:08:50

michiexile tweeted: @michiexile

RT @radicalbytes: Thoroughly unimpressed by the new Avengers trailer. Are we tired of men punching each other in the face to solve their pr…

2015-11-27 20:08:46

michiexile tweeted: @michiexile

RT @radicalbytes: Critique of sexism is met with cries of "What about the men?" So I've been tweeting about how media portrays men.
Spoile…

2015-11-27 20:08:42

michiexile tweeted: @michiexile

RT @radicalbytes: Them: They’re just pixels on a screen so there's no social impact.
Me: Riiiight, like how ink on paper has never had any…

2015-11-27 20:08:40

gaussianos tweeted: @gaussianos

RT @mezvan: Un mapamundi en un lago ... queda en algún lugar de Dinamarca
https://t.co/pVaXyDEZp8 https://t.co/HIBeMyyebK

2015-11-27 20:06:52

rmathematicus tweeted: @rmathematicus

RT @kleinalexandre: (Call for Papers) Objects of psychiatry: Between thing-making, reification & personhood https://t.co/TSFj5Opt6f #histme…

2015-11-27 20:05:15

X