# Posts

### July 28, 2014

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The U.S.'s most dominant industries look a lot different than they did less than 25 years ago.

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5:07 PM | Demographic Anomalies: US Edition

It’s been a while since we looked at American Community Survey data in Wolfram|Alpha. Our first efforts included surveying ACS data related to education, income, and diversity, only touching the tip of the iceberg. Recently, we took a deeper look at the data to unearth some of the least “average” communities in the US. As [...]

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In my last post I talked about how to plot polar curves in Geogebra. As I neared the end of the post I remembered how the use of sliders can enhance this topic. Below is a polar graph plotter. You can try this out now by dragging the slider alpha from 0 to 360 degrees. Move the slider back to 0 degrees and type in another function such as 3cos(5x), or 12/(2-sin(x)). A copy of this tool is available from the Geogebratube site here. I always have so much fun
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4:30 PM | A linguist has a question about sampling when the goal is causal inference from observational data

Nate Delaney-Busch writes: I’m a PhD student of cognitive neuroscience at Tufts, and a question came recently with my colleagues about the difficulty of random sampling in cases of highly controlled stimulus sets, and I thought I would drop a line to see if you had any reading suggestions for us. Let’s say I wanted […]
The post A linguist has a question about sampling when the goal is causal inference from observational data appeared first on Statistical Modeling, Causal
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There are not many women in the french Académie des Sciences. So it was a great news when last december Laure Saint-Raymond got elected (in the mechanics section, due to her work on physics equations, rather than in the math section). Today, there’s a portrait of her on the backpage of Libération (a nationwide french […]

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The title of this post is the tagline for Twitter Math Camp (Yes, that’s a thing). What people love about this conference is that the presenters are typically classroom teachers, sharing their best practices. There is real power in hearing about something from a colleague who actually does it successfully. During the conference, I had […]

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The Office of Research Integrity has sanctioned a former researcher in the lab of Linda Buck, winner of the 2004 Nobel Prize in Physiology or Medicine, for falsifying data in two papers written with the support of grants from the National Institutes of Health. The researcher, Zou Zhihua, worked with Buck as a post-doc at […]

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For as long as I can remember, my all-time favorite activity has been creating ideas and turning them into reality—a kind of “entrepreneurism of ideas”. And over the years—in science, technology and business—I think I’ve developed some pretty good tools and strategies for doing this, that I’ve increasingly realized would be good for a lot [...]

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4:00 PM | The Power and Peril of Positive Thinking

Having hammered away at the importance of student self-confidence and positive attitude as a condition for success in math (part of the larger discussion of applying Pólya's teaching principles), it's important to step back and point out that a lot of people have made horrible, costly mistakes thanks to positive thinking and the influence of motivational speakers (for example).With fantastic successes on one side and horror stories on the other, it is tempting to call this a wash, but if you […]

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4:00 PM | The Game Changes

Here is a fun interactive display by Noah Velltman of the height and weight of National Football League players from 1920 to 2014, via Statistical Modeling... Clicking on this link allows you to vary the year and observe the joint distribution of height and weight over the years. You can even see how the game as changed from the early 1990s as roles and players have become more specialized resulting in distinct clusters of body types.

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A University of Calgary diabetes researcher, Cory Toth, who told us earlier this year that he would cease publishing in the scientific literature, has two more retractions, making seven. Both appear in Neurobiology of Disease. Here’s the notice for “Differential impact of diabetes and hypertension in the brain: Adverse effects in white matter:” This article […]

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3:28 PM | “I would eat the extra meatball.”

Simon Terrell recaps his lesson study trip to Japan with Akihiko Takahashi, who was the subject of Elizabeth Green’s American math article last week: In one case, a teacher was teaching a lesson about division with remainders and the example was packaging meatballs in pack of 4. When faced with the problem of having 13 […]

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3:27 PM | The Mandelbrot Set

Check out this video on the very interesting Mandelbrot Set: Famously beautiful, the Mandelbrot Set is all about complex numbers. Featuring Dr Holly Krieger from MIT. Featured book: The Fractal Geometry of Nature Clouds are not spheres, mountains are not … Continue reading →

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Two different techniques to learn more about the subspace you're in.Compressed Subspace Matching on the Continuum by William Mantzel, Justin RombergWe consider the general problem of matching a subspace to a signal in R^N that has been observed indirectly (compressed) through a random projection. We are interested in the case where the collection of K-dimensional subspaces is continuously parameterized, i.e. naturally indexed by an interval from the real line, or more generally a
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3:03 PM | Write Once, Deploy Anywhere

Guest blogger Peter Webb returns with another in an occasional series of postings about application deployment.... read more >>

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2:44 PM | Why I Go to Twitter Math Camp

It’s funny – a year ago, after TMC13, I wrote a blog post entitled “TMC 13 - Minus the Math”. I find myself again not wanting to talk about the math that surrounded me at TMC14. It’s not that there were not great ideas presented or innovative ways of doing things, but more that the reason TMC is so special for me is due to the interactions that happen around and outside the math. Being constantly surrounded by up to 150 people for 4 days should sound a little like hell to an introvert
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2:25 PM | Stan NYC Meetup – Thurs, July 31

The next Stan NYC meetup is happening on Thursday, July 31, at 7 pm. If you’re interested, registration is required and closes on Wednesday night: http://www.meetup.com/Stan-Users-NYC/events/193685802/ The third session will focus on using the Stan language. If you’re bringing a laptop, please come with RStan, PyStan, or CmdStan already installed. We’re going to […]
The post Stan NYC Meetup – Thurs, July 31 appeared first on Statistical Modeling,
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Michael Fogus posted on Twitter this morning Computing: the only industry that becomes less mature as more time passes. The immaturity of computing is used to excuse every ignorance. There’s an enormous body of existing wisdom but we don’t care. I don’t know whether computing is becoming less mature, though it may very well be […]

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2:17 PM | Retro Math TV

(Click on the comic if you can't see the full image.) (C)Copyright 2014, C. Burke.The 90s version, The Rad Squad, wasn't as successful. Oscar and Fivex appeared together in another classicshow. You know how those numeric actors always like to work in pairs. Interesting (to me) Trivia!: This is comic #888 and it's appearing on 7/28/14, a day of sevens! Not that this was planned, my Internet was actually out for a day or so last week, and I wasn't feeling all that great anyway....

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2:10 PM | Half life of a beer can

References: Griffiths, David J. (2005), Introduction to Quantum Mechanics, 2nd Edition; Pearson Education – Problem 8.17. Whe we analyzed the WKB approximation for a particle tunneling through a barrier we came up with a formula for the transmission probability : where and the barrier extends from to . We can apply this formula to get […]

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2:00 PM | Chin Up, You

We're getting a post-TMC rush of folks posting about how interacting with our awesome community is making them feel a tad inadequate. I appreciate the honesty and the willingness to be vulnerable. Blogs are a great place for processing feelings, aren't they? And this is from a person who barely has any feelings, so you know it's true.I have some perspective now on being well-known by a certain small niche of the internet, and I want to tell you, every time you think "I am not as cool as that […]

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For decades the U.S has accounted for the lion’s share of business travel world-wide, but that is expected to change as China continues to spend more, according to a report by the Global Business Travel Association.
China is likely to take over from the U.S. in 2016, when its outlays on business travel are forecast to reach $346.4 billion, compared with $ 319.5 billion for the U.S. China’s spending is expected to continue to outpace the U.S. in the following few years.

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The 20th Industrial Mathematical and Statistical Modeling Workshop for Graduate Students (IMSM) just wrapped up its workshop last week. The students met for 10 days and broke into five teams, working with mentors from government and industry on real-world problems. … Continue reading →

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1:40 PM | one hundred years ago, a telegram…

Filed under: Books, Kids, pictures Tagged: Austro-Hungary, Frist World War, Serbia, telegram, war

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Sometimes, retractions seem to have a juicy back story, but the explanation proves tantalizingly out of reach. Such is the case for a law review retraction on a paper about reparations for human rights violations. After someone complained that author Gentian Zyberi “had not done sufficient justice to the substantial contribution” they made, the complainant refused […]

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1:27 PM | Alcune oche

Some GeeseEv-er-y child who has the use Of his sen-ses knows a goose. See them un-der-neath the tree Gath-er round the goose-girl's knee, While she reads them by the hour From the works of Scho-pen-hau-er How pa-tient-ly the geese at-tend! But do they re-al-ly com-pre-hend What Scho-pen-hau-er's driv-ing at? Oh, not at all; but what of that? Nei-ther do I; nei-ther does she; And, for that mat-ter, nor does he.
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References: Griffiths, David J. (2005), Introduction to Quantum Mechanics, 2nd Edition; Pearson Education – Problem 8.15b-f. Continuing our application of the WKB approximation to the problem of a double potential well, we can now look at determining the allowed energies for bound states. Since the potential is even, the wave function is a linear combination […]

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The Hausdorff Center for Mathematics (HCM) at the University of Bonn
brings together researchers in Theoretical and Applied Mathematics, and
Mathematical Economics. In this framework, the center is looking forward
to filling up to four
W2-Professorships
("Bonn Junior Fellows")
within the next few years. These are temporary positions for a period of
five years. To some of these positions, a tenure-track option is
associated, and, in exceptional cases, a position may be tenured
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Postdoctoral Positions
The Hausdorff Center for Mathematics (HCM) at Bonn University offers
several postdoctoral positions in all fields of mathematics and
quantitative economics. The duration of these positions is 2 years.
Expected starting date is no later than October 2015. There may be an
option of extension by up to one year, depending on the availability of
funding. There are no teaching obligations but such opportunities are
provided if desired by the candidates.
Your application
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1:00 PM | On deck this week

Mon: A linguist has a question about sampling when the goal is causal inference from observational data Tues: The Ben Geen case: Did a naive interpretation of a cluster of cases send an innocent nurse to prison until 2035? Wed: Statistics and data science, again Thurs: The health policy innovation center: how best to move […]
The post On deck this week appeared first on Statistical Modeling, Causal Inference, and Social Science.