April 24, 2014

5:41 AM | Publishing an R package in the Journal of Statistical Software
I’ve been an editor of JSS for the last few years, and as a result I tend to get email from people asking me about publishing papers describing R packages in JSS. So for all those wondering, here are some general comments. JSS prefers to publish papers about packages where the package is on CRAN and has been there long enough to have matured (i.e., obvious bugs ironed out and a few active users). This is partly because we have so many submissions that it helps to filter some out and this […]
5:32 AM | NASA Space Crews
In the Apollo missions many of the crew were experienced, but some were not. So I drew a diagram - see what patterns you see.
5:32 AM | Software Checklist
During the second World War, fighter pilots would scramble to take off. Their heart would stop when the engine mis-fired. Was the fuel mix too rich, or too lean? Turn the control wrong way and they could die ...
4:00 AM | Peirce’s 1870 “Logic Of Relatives” • Comment 10.10
The last of the three examples involving the composition of triadic relatives with dyadic relatives is shown again in Figure 25. (25) The hypergraph picture of the abstract composition is given in Figure 26. (26) This example illustrates the way that Peirce … Continue reading →

April 23, 2014

9:55 PM | [기노사키 온천여행 05] 소토유메구리(外湯めぐり) 시전
기노사키 온천 마을 여행에서 꼭 해야 할 과제가 있다면 바로 소토유메구리(外湯めぐり)이다. 말 그대로 기노사키 온천의 7개 온천을 돌아다니며 온천에 몸을 담구는 것. 이 때에는 유타카를 입고 돌아다니는 것이 아주 편하다(물론 평상복으로 돌아다니는 사람도 많고 크게 문제는 없다).   7개의 소토유들은 … Continue reading →Related Posts ?[교토 쿠라마 여행 05] 쿠라마 […]
8:45 PM | Phil 6334 Visitor: S. Stanley Young, “Statistics and Scientific Integrity”
We are pleased to announce our guest at Thursday’s seminar (April 24, 2014): “Statistics and Scientific Integrity”: S. Stanley Young, PhD  Assistant Director for Bioinformatics National Institute of Statistical Sciences Research Triangle Park, NC     The main readings for the discussion are:  Young, S. & Karr, A. (2011). Deming, Data and Observational Studies. Signif. 8 (3), 116–120. […]
2:28 PM | Birth and death of zipper combinators (I)
Because zipper logic is a graph rewriting system which does not use variable names, just like GLC and chemlabda,  it needs ways to multiply, distribute or kill  things. See  Chemlambda, universality and self-multiplication  for multiplication, distribution or propagation phenomena. In this post we shall see how zipper combinators die or are born, depending on the sense […]
1:30 PM | Peirce’s 1870 “Logic Of Relatives” • Comment 10.9
The use of the concepts of identity and teridentity is not to identify a thing-in-itself with itself, much less twice or thrice over — there is no need and therefore no utility in that. I can imagine Peirce asking, on Kantian … Continue reading →

April 22, 2014

9:30 PM | Peirce’s 1870 “Logic Of Relatives” • Comment 10.8
There’s a critical transition point that we find in sight of Peirce’s 1870 Logic of Relatives and it’s a point that turns on the teridentity relation. In taking up the next example of relational composition, let’s substitute the relation for … Continue reading →
8:18 PM | Drexel on Monday 4/28
Looks interesting if you're in the area.  I plan to be at the lunch.From: Drexel University's LeBow College of Business <announce@lebow.drexel.edu>Date: Thu, Apr 17, 2014 at 11:14 AMSubject: School of Economics Presents: 2 Presentations by Dr. Preston McAfee, Director, Google Strategic Technologies: 4.28.14 Please join Drexel School of Economics for one or both of the two presentations that will be given by Dr. Preston McAfee, Director, Google Strategic […]
12:49 PM | ESF workshop Glasgow – 16th-18th June 2014
Thanks to the kind support of the European Science Foundation the University of Glasgow will be hosting a workshop in June focused on reconnection events in classical, quantum and classical fluids. Reconnections are dramatic events, leading to irreversible changes in the topology of a system. In particular they are crucial in understanding magnetic fields in rarefied plasmas, […]
12:09 PM | AdAuctions Workshop deadline extended to April 27
The organizers of the AdAuctions workshop have extended the submission deadline to April 27. Updated information on the workshop is as follows. The Tenth Ad Auction Workshop  (here is the call for papers) Date: June 8, 2014, 8:30-15:30 Submission deadline: April 27, 2014, (23:59 Hawaii time) Organizing Committee: adauctions2014@gmail.com Itai Ashlagi (MIT Sloan) Patrick Jordan […]
11:21 AM | Kepler e la ricerca degli esopianeti in classe
Alcuni giorni fa, la missione Kepler ha annunciato la scoperta di un nuovo pianeta extrasolare, Kepler-186f, che è risultato roccioso e molto simile alla Terra non solo per dimensioni, ma anche per posizione e distanza dalla stella intorno cui ruota, Kepler-186, una nana rossa di classe M1 che si trova a circa 500 anni luce dal nostro pianeta. L'annuncio è stato accompagnato anche da un articolo su Science, che però è stato anche reso disponibile dalla Nasa in formato pdf. (i pianeti in […]
3:22 AM | Phil 6334: Foundations of statistics and its consequences: Day #12
We interspersed key issues from the reading for this session (from Howson and Urbach) with portions of my presentation at the Boston Colloquium (Feb, 2014): Revisiting the Foundations of Statistics in the Era of Big Data: Scaling Up to Meet the Challenge. (Slides below)*. Someone sent us a recording  (mp3)of the open-ended panel discussion from that Colloquium including: Mayo, Xiao-Li Meng (Harvard), Kent Staley […]
12:33 AM | Seven forecasting blogs
There are several other blogs on forecasting that readers might be interested in. Here are seven worth following: No Hesitations by Francis Diebold (Professor of Economics, University of Pennsylvania). Diebold needs no introduction to forecasters. He primarily covers forecasting in economics and finance, but also xkcd cartoons, graphics, research issues, etc. Econometrics Beat by Dave Giles. Dave is a professor of economics at the University of Victoria (Canada), formerly from my own […]

April 21, 2014

11:57 PM | Changing the ORDER you teach things in might help A LOT
I am teaching the undergrad jr/sr course Elementary Theory of Computation which is Reg Langs, Context free Langs, Computability theory, P and NP. Over the last few years I've changed some of the content (I dumped CFLs-- don't worry, they cover them some in the Prog Langs course) but more to my point today changed the ORDER I do things in Change  1: Do P and NP first and Computability later. While this is not historically accurate (which may be why the order was what it was) this is […]
9:00 PM | Seymour’s 1-flowing conjecture I
Let $G$ be a graph with distinct vertices $s$ and $t$, and let $\mathcal{C}$ be the family of paths from $s$ to $t$. Let us say that a subfamily of $\mathcal{C}$ is a matching if its members are pairwise edge-disjoint. … Continue reading →
6:33 PM | Indifference graphs and their construction
I just added a new article to Wikipedia on indifference graphs (also known as unit interval graphs or proper interval graphs): the graphs formed from sets of points on the real line by connecting every two points whose distance is less than one.There are many papers on algorithms for going from the graph to a geometric representation in linear time. The following method for the reverse problem, going from the set of points (or equivalently unit intervals) to its graph must be known, possibly in […]
6:14 PM | A TED experience
Around one year ago, I unexpectedly received an e-mail asking if I would speak at a local TEDx Youth event themed “Daring Discoveries”.  I hadn’t attended a TEDx conference before (sadly I couldn’t make either of the previous ones held … Continue reading →
3:00 PM | “How clean is your cloud” two years later
Two years ago, Greenpeace put out a report titled “How clean is your cloud,” taking many of the IT giants to task for their lack of  commitment to sustainability in their data centers.  Now, a few years later, Greenpeace is still at it and has been pushing hard with a mixture of yearly public praise/shaming […]
11:25 AM | On Kaggle Forecasting Competitions, Part 1: The Hold-Out Sample(s)
Kaggle competitions are potentially pretty cool. Kaggle supplies in-sample data ("training data"), and you build a model and forecast out-of-sample data that they withhold ("test data"). The winner gets a significant prize, often $100,000.00 or more. Kaggle typically runs many such competitions simultaneously.The Kaggle paradigm is clever because it effectively removes the ability for modelers to peek at the test data, which is a key criticism of model-selection procedures that claim to […]
4:39 AM | A Preview of Barbados/Bellairs
This post is probably not so interesting unless you plan to travel to the Caribbean in a few weeks. The website for the conference is offline, so I thought I might update attendees on what might be happening, at least … Continue reading →
3:45 AM | Cross-validation in finance, psychology, and political science
A large chunk of machine learning (although not all of it) is concerned with predictive modeling, usually in the form of designing an algorithm that takes in some data set and returns an algorithm (or sometimes, a description of an algorithm) for making predictions based on future data. In terminology more friendly to the philosophy […]

Bailey, D., Borwein, J., de Prado, M.L. & Zhu, Q. (2014). Pseudo-Mathematics and Financial Charlatanism: The Effects of Backtest Overfitting on Out-of-Sample Performance, Notices of the American Mathematical Society, 61 (5) 458. DOI:

2:58 AM | ICM Survey: Sum-of-squares proofs and the quest toward optimal algorithms
I have just posted online a new survey “Sum-of-Squares proofs and the quest toward optimal algorithms” co-authored with David Steurer . The survey discusses two topics I have blogged about before – Khot’s Unique Games Conjecture (UGC) and the Sum-of-Squares (SOS) method – and the connections between them. Both are related to the notion of meta algorithms. […]

April 20, 2014

9:28 PM | What’s it about women and science?
Simplistic, but quite to the point… “I’ve never been female, but I’ve been black all my life and so let me perhaps offer some insight from that perspective. I got to see how the world around me reacted to my expressions of these ambitions. All I can say that is the fact that I wanted […]
8:04 PM | Teach Yourself Logic, new layout
The Teach Yourself Logic Guide has a new look. Now, instead of being a standard A4 PDF, it should be an ideal size for reading on screen. Read it either (i) on an iPad (download in Safari, open e.g. in … Continue reading →
6:22 PM | §11.4: Gaussian surface area and Bobkov’s Inequality
This section is devoted to studying the Gaussian Isoperimetric Inequality. This inequality is a special case of the Borell Isoperimetric Inequality (and hence also a special case of the General-Volume Majority Is Stablest Theorem); in particular, it’s the special case arising from the limit $\rho \to 1^{-}$. Restating Borell’s theorem using rotation sensitivity [...]
2:42 AM | Getting Credit (or blame) for Something You Didn’t Do (BP oil spill)
  Four years ago, many of us were glued to the “spill cam” showing, in real time, the gushing oil from the April 20, 2010 explosion sinking the Deepwater Horizon oil rig in the Gulf of Mexico, killing 11, and spewing oil until July 15.(Remember junk shots, top kill, blowout preventers?)[1] The EPA has lifted its gulf drilling ban on BP just […]

April 19, 2014

9:42 PM | [기노사키 온천여행 04] 유카타를 입은 사람들 – 늦은 오후의 거리
료칸 미키야에서 체크인을 끝내고 밖으로 나와 봤습니다. 외양 온천 메구리를 즐기기 전에 일단 마을의 이곳저곳을 좀 돌아다녀 보기 위해서… 역시 평상복을 입고 돌아다니는 사람들보다 유카타를 걸치고 있는 사람들이 훨씬 많았습니다. 유카타를 보면 머물고 있는 료칸이 어딘지도 알 수 있죠! 7개의 … Continue reading →Related Posts ?[교토 쿠라마 여행 05] 쿠라마 온천 […]
9:07 PM | Structures in solution spaces
As I promised earlier, here is the video for my talk on "structures in solution spaces" at the Conference on Meaningfulness and Learning Spaces last February.It was a wide-ranging talk, about learning spaces, distributive lattices and Birkhoff's representation theorem for them, rectangular cartograms, antimatroids, the 1/3-2/3 conjecture for partial orders and antimatroids, partial cubes, and flip distance in binary trees and point sets. It was also about an hour long, so don't watch unless you […]
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