Mathblogging.orgRecent Postshttp://www.mathblogging.org/scripts/feed.php2014-07-29T02:38:31-04:00No copyright asserted over individual posts; see original posts for copyright and/or licensing.Mathblogging.org Atom serializerThe Future of the Math Twitterblogospherehttp://www.mathblogging.org/post/940312014-07-28T19:22:10-04:00dkane47Wow. That was a big title. This post comes out of a number of conversations at Twitter Math Camp, but in particular a conversation with Justin Lanier, Michael Pershan, Malke Rosenfeld, and a rotating cast of others about the changing role of Twitter and blogs in the MTBoS. A topic we returned to a number […]yo-ho, yo-ho, a pirate’s life for mehttp://www.mathblogging.org/post/940332014-07-28T19:08:42-04:00vlorbikOn This Day in Math - July 29http://www.mathblogging.org/post/940352014-07-28T19:00:00-04:00Pat Ballew<br /><br />To call in the statistician after the experiment is done may beno more than asking hm to perform a postmortem examination: he may be able to say what the experiment died of. ~Ronald Fisher <br /><br />The 210th day of the year; (21, 20, 29) and (35, 12, 37) are the two least primitive Pythagorean triangles with different hypotenuses and the same area (=210). Students are challenged to find another pair of such PPTs <br /><br />EVENTS1654 Pascal wrote a letter to Fermat agreeing to a result of Fermat on a probability […]Scumbag Brainhttp://www.mathblogging.org/post/940362014-07-28T18:35:06-04:00MaiuMath and History: A Look at Slaveryhttp://www.mathblogging.org/post/940292014-07-28T18:32:29-04:00UnknownGeoff and I decided to go on a plantation tour on Saturday. Before we had committed to this, I was feeling uneasy about how morally gray this experience might be, so I did some research and found out online that there is a plantation that runs its tours with historical accuracy and talks about slavery with candor. So, that was the one we decided to go on. The tour was combined with going to another plantation also in the area, and the experience was one that I will not forget.<br /><br />This is what I
[…]Bangalore snapshot [ಬೆಂಗಳೂರು ಚಿತ್ರ]http://www.mathblogging.org/post/940322014-07-28T18:14:51-04:00xi'anFiled under: pictures, Travel Tagged: Bangalore, India, Kannada, Karnataka, KR Market, stormutopian01:
Sine 02b.http://www.mathblogging.org/post/940282014-07-28T18:01:22-04:00Unknown<br/><br/>utopian01:
Sine 02b.
SciLua 2 includes NUTShttp://www.mathblogging.org/post/940262014-07-28T18:00:02-04:00Bob CarpenterThe most recent release of SciLua includes an implementation of Matt’s sampler, NUTS (link is to the final JMLR paper, which is a revision of the earlier arXiv version). According to the author of SciLua, Stefano Peluchetti: Should be quite similar to your [Stan's] implementation with some differences in the adaptation strategy. If you have […]
The post SciLua 2 includes NUTS appeared first on Statistical Modeling, Causal Inference, and Social Science.Honored to teach Honors Precalculushttp://www.mathblogging.org/post/940302014-07-28T17:59:02-04:00Dave aka Mr. Math TeacherA little over a year ago, I outlined a curriculum for a regular precalculus course for use by two other teachers in our department. I hoped to help better align student readiness for AP Calculus as prior students arrived deficient … Continue reading →De normale verdelinghttp://www.mathblogging.org/post/940272014-07-28T17:26:00-04:00Willem van Ravenstein <br />voorkennisde standaardafwijkingeigenschappen van de normale verdelingoppervlakten onder normaalkrommentoepassingen van de normale verdelingde binomiale en de normale verdeling...en dat was dan hoofdstuk 7 voor HAVO 4 wiskunde D. Doe's normaal man!:-)Observations on the PARCC sample Geometry examhttp://www.mathblogging.org/post/940152014-07-28T17:24:18-04:00Jason DyerPart 1: Observations on the PARCC sample Algebra I exam Part 2: Observations on the PARCC sample Algebra II exam Part 3: Observations on the PARCC sample Geometry exam Calculator part: 18 of 25 Use the information provided in the animation to answer the questions about the geometric construction. To pause the animation, select the […]The Beauty of Mathematicshttp://www.mathblogging.org/post/940132014-07-28T17:17:24-04:00Joanie SilvermanMy Favorite From TMC14http://www.mathblogging.org/post/940112014-07-28T16:57:13-04:00dkane47This is a quick summary of My Favorite from TMC. I spent three weeks before Twitter Math Camp backpacking the John Muir Trail in the Sierras of California. I spent a lot of time in really beautiful places, like this one: Of course, hiking alone for a few weeks, I got bored from time to […]Particelle familiarihttp://www.mathblogging.org/post/940062014-07-28T16:33:00-04:00zar<br /><br />Recensione breve: ho letto il libro Particelle familiari di Marco Delmastro e mi è piaciuto, leggetelo.<br /><br />Recensione lunga: Marco Delmastro è un fisico che lavora a ATLAS, uno degli esperimenti del CERN che ha osservato il (un?) bosone di Higgs. In questo libro racconta cosa fa un fisico sperimentale, come fa a osservare particelle così piccole e elusive che anche solo il termine "osservare" assume significati nuovi.<br /><br />Il libro è dedicato a chi non sa niente di fisica e vorrebbe saperne qualcosa […]Book Study Monday: Teaching Numeracy, Critical Habit 7http://www.mathblogging.org/post/940122014-07-28T16:18:00-04:00Donna Boucher<br />It's Monday, so that must mean it's time for great math discussions! If you're just joining us, we're reading and discussing Teaching Numeracy, 9 Critical Habits to Ignite Mathematical Thinking, by Margie Pearse and K. M. Walton. <br /><br />Reading ScheduleJune 30Preface and IntroductionJuly 7Critical Habits 1 & 2July 14Critical Habits 3 & 4July 21Critical Habits 5 & 6July 28Critical Habit 7Aug 4Critical Habits 8 & 9Aug 11Essential Components 1, 2, & 3Aug 18Essential
[…]@Plickers #tmc14 #myfavhttp://www.mathblogging.org/post/940252014-07-28T16:13:18-04:00Pam WilsonAn APP I downloaded early in the summer, then forgot about it until dinner Friday night. Something was said which triggered a thought, so I pulled out my phone to share with my #tmc14 roomies. Click here for more info. I was already scheduled for a #myfav Saturday a.m. so why not introduce this fun […]Mr. P!http://www.mathblogging.org/post/940032014-07-28T15:58:33-04:00AndrewChris Skovron writes: A colleague sent the attached image from Indonesia. For whatever reason, it seems appropriate that Mr. P is a delicious salty snack with the tagline “good times.” Indeed. MRP has made the New York Times and Indonesian snack food. What more can we ask for?
The post Mr. P! appeared first on Statistical Modeling, Causal Inference, and Social Science.staceythinx:
Selections from Tallmadge Doyle’s...http://www.mathblogging.org/post/940092014-07-28T15:56:28-04:00Unknown<br/> <br/><br/> <br/><br/> <br/><br/> <br/><br/> <br/><br/> <br/><br/> <br/>staceythinx:
Selections from Tallmadge Doyle’s ethereal Celestial Mapping Series
A student asks: How do you simplify surds?http://www.mathblogging.org/post/940142014-07-28T15:38:49-04:00ColinA student asks: How could I simplify a sum like $(\sqrt 3+\sqrt 2)(\sqrt 3-\sqrt 2)$? Great question! The trick is to treat it like it’s an algebraic bracket, like this: $(x + y)(x – y) = x^2 + yx – xy – y^2$ But then you’ve got $+yx -xy$ in the middle there, which adds up to nothing: $(x+y)(x-y) = x^2 – y^2$ (that’s the difference of two squares – it comes up a lot). If you do that with $(\sqrt 3 + \sqrt 2)(\sqrt 3 – \sqrt 2)$, you get
[…]wolframalpha:
Just how much Jazzercise would it take to shake...http://www.mathblogging.org/post/940102014-07-28T15:26:27-04:00Unknown<br/><br/>wolframalpha:
Just how much Jazzercise would it take to shake off the calories from 100 Taco Bell tacos? http://wolfr.am/1kjq1rK
[Makeover] Central Park & These Tragic “Write An Expression” Problemshttp://www.mathblogging.org/post/940082014-07-28T15:23:50-04:00Dan MeyerPreviously: [Makeover] These Tragic “Write An Expression” Problems tl;dr. I made another digital math lesson in collaboration with Christopher Danielson and our friends at Desmos. It’s called Central Park and you should check out the Walkthrough. Here are two large problems with the transition from arithmetic to algebra: Variables don’t make sense to students. We […]Rogue waves: The real monsters of the deephttp://www.mathblogging.org/post/940052014-07-28T15:00:00-04:00UnknownThey were dismissed as sailors' tall tales, but they're real: huge waves that rise without warning and can destroy ships. Is there any way to predict them?<br clear='all'/><br/><br/><br/><br/><br/><br/>Rank 2 versus rank 3http://www.mathblogging.org/post/940042014-07-28T14:57:45-04:00JSEOne interesting feature of the heuristics of Garton, Park, Poonen, Wood, Voight, discussed here previously: they predict there are fewer elliptic curves of rank 3 than there are of rank 2. Is this what we believe? On one hand, you might believe that having three independent points should be “harder” than having only two. But […]staceythinx:
Within Invisibility by Jiayu Liu is an...http://www.mathblogging.org/post/939962014-07-28T14:29:11-04:00Unknown<br/> <br/><br/> <br/>staceythinx:
Within Invisibility by Jiayu Liu is an installation powered by the wind of 40 Chinese cities.
Liu on her work:
What if we use wind to represent wind?
This project is about nostalgia, personal investigation, and testing the boundaries of data visualisation, and creating a multisensory experience of invisible data. Within Invisibility renders wind data into a multisensory experience. Live data comes from 40 major Chinese cities, each represented by two fans. Each fan shows a
[…]Finding infrequent errors in MATLAB with DBSTOP if errorhttp://www.mathblogging.org/post/939942014-07-28T13:40:42-04:00DougFinding infrequent errors in MATLAB with DBSTOP if error Some errors happen in MATLAB infrequently. If you don’t know the conditions when they occur, setting a breakpoint might not work. Using DBSTOP if error will have MATLAB stop on a line in the editor only when the error condition is tripped.
... read more >>How America’s Top Industries Have Changed, 1990-2013http://www.mathblogging.org/post/939902014-07-28T13:15:36-04:00Rani MollaThe U.S.'s most dominant industries look a lot different than they did less than 25 years ago.
Demographic Anomalies: US Editionhttp://www.mathblogging.org/post/939852014-07-28T13:07:25-04:00Emily SuessIt’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 [...]#July2014Challenge: Dynamic Polar Curve Plotterhttp://www.mathblogging.org/post/939952014-07-28T13:02:00-04:00Shelley CarranzaIn 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. <br /><br />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. <br /> <br /><br />I always have so much fun
[…]A linguist has a question about sampling when the goal is causal inference from observational datahttp://www.mathblogging.org/post/939932014-07-28T12:30:40-04:00AndrewNate 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
[…]Laure Saint-Raymond on the backpage of Libérationhttp://www.mathblogging.org/post/939792014-07-28T12:25:32-04:00Thomas SauvagetThere 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 […]