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Posts

December 22, 2014

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5:37 PM | CMC-South & North
Even setting my home-state bias aside, the two California math education conferences are best-in-class. This year’s Northern conference in Monterey, CA, was the best PD I’ve ever had. Michael Fenton has written up a comprehensive set of recaps of both the North and South conferences, including talks by Robert Kaplinsky, Jo Boaler, Max Ray, Tony […]
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5:32 PM | 5 and 1/2 x 2 and 1/4 = 7 and 3/4
I find this fascinating. This student clearly knows how that multiplying the base and the height of a rectangle gives you its area. She even knows how to multiply fraction. But when it comes to part (d), she adds the numbers instead of multiplying them. In earlier writing I hypothesized that, when put in unfamiliar situations, students… Continue reading →
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5:19 PM | Competing Foundations?
foundations conference
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5:01 PM | Paradox Industries
Paradox Industries   by jclark3   http://im-possible.info/english/art/computer/jclark3.html   Author - http://jclark3.tumblr.com/
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5:00 PM | True Size of Africa
Although not strictly a statistical concept, I very much like these sort of comparisons. They startle your expectations. Via Kai Krause.
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4:45 PM | Decision cascades in social networks
Math can shed light on spread of behaviors in online interactions Philadelphia-PA—How do people in a social network behave? How are opinions, decisions and behaviors of individuals influenced by their online networks? Can the application of math help answer these questions? “The way in which information, decisions, and behaviors spread through a network is a […]
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4:30 PM | Paper that formed basis of study retracted earlier this year retracted itself, from Science
Back in May, we reported on a retraction from Molecular Cell that referred to a 2012 study the same group had published in Science. (A few weeks later, the lab head told us just how painful the process was.) Now, the Science paper has been retracted. Here’s the notice: In our Report “Polymerase exchange during Okazaki fragment synthesis observed in […]The post Paper that formed basis of study retracted earlier this year retracted itself, from Science appeared first on […]
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4:30 PM | Distinguishing Cause from Effect using Observational Data: Methods and Benchmarks
More work paralleling that of David Lopez-Paz et al's s Non-linear Causal Inference using Gaussianity Measures - implementation - ( We featured David at Paris Machine Learning #2 Season 2 ). A simple note when one looks at this from the signal processing standpoint. There, we usually set problems as y = A x + epsilonwhere epsilon is some gaussian noise. In these papers on causality, that specific shape for the noise would tend to imply that y is not the result of x as "residuals in the […]
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4:20 PM | Desmos on Android
A happy day! Desmos comes to Android and I now have the best handheld graphing calculator I have ever had! As you would expect of Desmos, it just works! Get it on Google play here. (Desmos iOS apps have been available … Continue reading →
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3:59 PM | Groupon Discounts and Offers
The holiday season is here, and check out the deals on Groupon to save while buying presents or delicious food!  Filed under: groupon Tagged: groupon
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3:47 PM | Research benefits of feminism
Unlike that famous bank teller, I’m not “active in the feminist movement,” but I’ve always considered myself a feminist, ever since I heard the term (I don’t know when that was, maybe when I was 10 or so?). It’s no big deal, it probably just comes from having 2 big sisters and growing up during […] The post Research benefits of feminism appeared first on Statistical Modeling, Causal Inference, and Social Science.
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3:42 PM | [DMANET] Postdoctoral scholar & PhD student position in Helsinki
----------------------------------------------------------------------------------- Postdoctoral Researcher and Doctoral Candidate, Helsinki ----------------------------------------------------------------------------------- The Department of Communications and Networking (Comnet) at the Aalto University School of Electrical Engineering is seeking to hire outstanding researchers for the User Interfaces group to two fully funded positions: * Postdoctoral Researcher * Doctoral Candidate The […]
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3:37 PM | Whew!
Hello vacation. I have a love/hate thing going with time off. * Love the 9 hours of sleep each night. * Hate not having so many people to interact with. * Love being able to read good books. * Hate that at the end of a day I sat too much ("worse than smoking" is now a thing). * Love that I have time to cook non-frozen things. * Hate that the refrigerator is right there. All the time. Waiting. Calling.Last week of school. There is a student that hangs out in my room […]
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3:24 PM | NSF Funding Opportunity: The math and stats of cyberspace and cybersecurity
From the NSF: The National Science Foundation (NSF) Division of Mathematical Sciences encourages the mathematical sciences community to participate in cybersecurity research.  This crucial national priority area is replete with challenges that can be addressed by the mathematical sciences. Traditionally, mathematics has played a central role in computer security, first in the design of computers […]
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3:02 PM | Creation and annihilation operators in the harmonic oscillator: a few theorems
Reference: Tom Lancaster and Stephen J. Blundell, Quantum Field Theory for the Gifted Amateur, (Oxford University Press, 2014), Problem 3.2. For the harmonic oscillator, we’ve seen that the effects of the creation and annihilation (raising and lowering) operators are Therefore From the commutation relation we’d like to prove that We can prove this using mathematical […]
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2:30 PM | Researchers retract paper for which first author won an award — but won’t sign notice
Most of the authors of two Molecular Cell papers have retracted them after becoming aware of inappropriate image manipulation by the first author of both — who refused to sign the notices. One of the papers, “Role of the SEL1L:LC3-I Complex as an ERAD Tuning Receptor in the Mammalian ER,” earned first author Riccardo Bernasconi, who […]The post Researchers retract paper for which first author won an award — but won’t sign notice appeared first on Retraction […]
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2:26 PM | Say happy birthday to Christopher Zeeman on his 90th
Maths hero Christopher Zeeman will turn 90 in February. Normally when a mathematician reaches a big round number of years, there’ll be a celebratory day of lectures or even a small book. The LMS has decided to take things even further by setting up a website to collect people’s birthday wishes, as well as personal... Read more »
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2:03 PM | Clever Way of Putting on a Duvet Cover
My wife and I put on a Christmas-themed duvet cover last night using the technique shown in this video. The approach reminds me of some topology demonstrations. The method worked as advertized.
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2:00 PM | On deck this week
Mon: Research benefits of feminism Tues: Using statistics to make the world a better place? Wed: Trajectories of Achievement Within Race/Ethnicity: “Catching Up” in Achievement Across Time Thurs: Common sense and statistics Fri: I’m sure that my anti-Polya attitude is completely unfair Sat: The anti-Woodstein Sun: Sometimes you’re so subtle they don’t get the joke The post On deck this week appeared first on Statistical Modeling, Causal Inference, and Social Science.
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2:00 PM | In Memoriam
Last week, I was shocked to learn of the unexpected death of Tim Cochran, a topologist from my grad school alma mater, Rice University. In addition to being a well-respected mathematician, he was an advocate for women and other underrepresented groups … Continue reading →
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2:00 PM | I'm more comfortable blaming the victim a little when the victim has a market cap of twenty billion
While in no way taking away from the magnitude of the criminal acts involved in the Sony hacks, it is important to remember that upper-level management gets such high salaries in part because they are supposed to anticipate threats and take steps to minimize their potential impact.At Sony, not so much...The new trove appears to include a collection of documents the hackers came across on the Sony Pictures network that had “password” in their titles, and includes digital keys for everything […]
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1:30 PM | 12/22/14
12 * 2 = (2 - 1) * 4! Also: 12 / 2 = (2 * 1) + 4 Also: 12 / (2 * 2) = |1 - 4| Also: 1 + 2 - 2 + 2 = |1 - 4|
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1:00 PM | A Big Family (puzzle)
Another problem to kick off the week, once again adapted from Henry Dudeney:Max, who already has some children from a prior marriage, marries the widow Wilma who also has some prior children. A dozen years later their family has a total of 12 children, including all prior children and the new ones resulting from their marriage. Each partner, Max and Wilma, have 9 children (out of the 12) that they are direct parents of.  How many children have been born to Max and Wilma together in the […]
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12:34 PM | Wann beherrscht man etwas?
Immer wieder hört man von Eltern die Aussage: “Zuhause hat er/sie es aber noch gekonnt!” Wie reagiert man darauf, wenn dann doch die 5 oder 6 nur herausgekommen ist? In einem Forum aus dem Internet ist mir jetzt erst so richtig klar geworden, was das Problem ist: Oftmals wird “Können” mit “Beherrschen” gleichgesetzt. Was aber … Wann beherrscht man etwas? weiterlesen →
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12:14 PM | Holiday Haze
Your dedicated blogger is about to vanish in the holiday haze, presumably returning early in the new year. I hope to see you at the Boston ASSA Penn party. (I promise to show up this time. Seriously.) Meanwhile, all best wishes for the holidays.[Photo credit:  Public domain, by Marcus Quigmire, from Florida, USA (Happy Holidays  Uploaded by Princess Mérida) [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons]
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11:59 AM | Mortgage tax deductions and gentrification
Yesterday we had a tax expert come talk to us at the Alternative Banking group. We mostly focused on the mortgage tax deduction, whereby people don’t have to pay taxes on their mortgage. It’s the single biggest tax deduction in America for individuals. At first blush, this doesn’t seem all that interesting, even if it’s […]
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11:52 AM | #27 Maria und Rage Against the Machine
Alles klar, los geht’s.                                 Maria  [Lukas 1v38] It has to start somewhere, it has to start sometime.What better place than here? What better time than […]
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11:29 AM | Bolas y estrella [Tito Eliatron Dixit]
Mi mágica felicitación navideña titulada Bolas y estrella participa en #CarnaMat59
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11:27 AM | Factorize a^3-b^3 (O Level Math Tuition Question)
Originally posted on Singapore Maths Tuition:So,
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11:20 AM | More Tips on Book and Thesis Writing
Following my earlier post Top Five Tips on Book Writing, here are seven more tips. These apply equally well to writing a thesis. 1. Signpost Citations In academic writing we inevitably include a fair number of citations to entries in … Continue reading →
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