The inverse of the Hilbert matrix

April 23, 2014
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The inverse of the Hilbert matrix

Just one last short article about properties of the Hilbert matrix. I've already blogged about how to construct a Hilbert matrix in the SAS/IML language and how to compute a formula for the determinant. One reason that the Hilbert matrix is a famous (some would say infamous!) example in numerical […]

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A short questionnaire regarding the subjective assessment of evidence

April 23, 2014
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E. J. Wagenmakers writes: Remember I briefly talked to you about the subjective assessment of evidence? Together with Richard Morey and myself, Annelies Bartlema created a short questionnaire that can be done online. There are five scenarios and it does not take more than 5 minutes to complete. So far we have collected responses from […]The post A short questionnaire…

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Applied Statistics Lesson of the Day – Notation for Fractional Factorial Designs

Applied Statistics Lesson of the Day – Notation for Fractional Factorial Designs

Fractional factorial designs use the notation; unfortunately, this notation is not clearly explained in most textbooks or web sites about experimental design.  I hope that my explanation below is useful. is the number of levels in each factor; note that the notation assumes that all factors have the same number of levels. If a factor has […]

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When less is more

April 23, 2014
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When less is more

Recently the Center for Medicaid and Medicare Services (CMS) released provider utilization and payment data. This is part of the government's ongoing push for transparency into medical services and costs. You may remember that last year they released hospital specific Medicare data. This time the data is practioner specific. This large dataset (over 9 million records) has a wealth of…

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What is meant by regression modeling?

April 22, 2014
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What is meant by regression modeling?

What is meant by regression modeling? Linear Regression is one of the most common statistical modeling techniques. It is very powerful, important, and (at first glance) easy to teach. However, because it is such a broad topic it can be a minefield for teaching and discussion. It is common for angry experts to accuse writers […] Related posts: How robust…

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A helpful structure for analysing graphs

April 22, 2014
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A helpful structure for analysing graphs

Mathematicians teaching English “I became a maths teacher so I wouldn’t have to mark essays” “I’m having trouble getting the students to write down their own ideas” “When I give them templates I feel as if it’s spoon-feeding them” These … Continue reading →

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Drexel on Monday 4/28

April 22, 2014
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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 D...

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Picking a (bio)statistics thesis topic for real world impact and transferable skills

April 22, 2014
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One of the things that was hardest for me in graduate school was starting to think about my own research projects and not just the ideas my advisor fed me. I remember that it was stressful because I didn't quite … Continue reading →

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Examen, Séries Chronologiques

April 22, 2014
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Après les exposés des dernières séances, l’examen du cours MAT8181, Séries Chronologiques avait lieu ce matin (et devrait finir dans quelques minutes, avec un peu de temps supplémentaire pour certain, compte tenu de la panne de métro qu&#...

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Ticket to Baaaaarf

April 22, 2014
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A link from the comments here took me to the wonderfully named Barfblog and a report by Don Schaffner on some reporting. First, the background: A university in England issued a press release saying that “Food picked up just a few seconds after being dropped is less likely to contain bacteria than if it is […]The post Ticket to Baaaaarf…

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Stata-Bloggers revamped

April 22, 2014
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Stata-Bloggers revamped

STATA-Bloggers has been out for a year and has gotten a bit of a facelift.  Still far fewer bloggers (9) than would be ideal to maintain an aggregator, but probably the best source for an aggregate feed on Stata news.  Please contact me if yo...

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Notes from the Tokyo R User Group meeting, 17 April 2014

April 22, 2014
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Notes from the Tokyo R User Group meeting, 17 April 2014

Last Thursday I had the pleasure to attend the Tokyo R user group meeting. And what a fun meeting it was! Over 40 R users had come together in central Tokyo. Yohei Sato, who organises the meetings, allowed me to talk a little about the recent developme...

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Seven forecasting blogs

April 22, 2014
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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…

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More On the Limitations of the Jarque-Bera Test

April 21, 2014
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More On the Limitations of the Jarque-Bera Test

Testing the validity of the assumption, that the errors in a regression model are normally distributed, is a standard pastime in econometrics. We use this assumption when we construct standard confidence intervals  for, or test hypotheses about, t...

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Ray Fair’s Model(s) in EViews

April 21, 2014
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Ray Fair’s Model(s) in EViews

Here's a follow-up to my recent post about the Federal Reserve U.S. macroeconometric model being freely available in EViews formatRay Fair's well-known model for the U.S. economy is also now available in a form that's ready to play with in EViews....

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Stan Model of the Week: Hierarchical Modeling of Supernovas

April 21, 2014
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Stan Model of the Week: Hierarchical Modeling of Supernovas

The Stan Model of the Week showcases research using Stan to push the limits of applied statistics.  If you have a model that you would like to submit for a future post then send us an email. Our inaugural post comes from Nathan Sanders, a graduate student finishing up his thesis on astrophysics at Harvard. […]The post Stan Model of…

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RStata: Funny or just annoying?

April 21, 2014
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RStata: Funny or just annoying?

Okay okay.  The joke is up.  Besides likely necessitating an emergency call to from the Stata Management Team to the Stata Legal Team, my post on April 1st of 2014 entitled "RStata: Stata Fully Mapped into R", was intended as a practical joke...

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Ticket to Baaaath

April 21, 2014
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Ticket to Baaaath

Ooooooh, I never ever thought I’d have a legitimate excuse to tell this story, and now I do! The story took place many years ago, but first I have to tell you what made me think of it: Rasmus Bååth posted the following comment last month: On airplane tickets a Swedish “å” is written as […]The post Ticket to Baaaath…

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On deck this week

April 21, 2014
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Mon: Ticket to Baaaath Tues: Ticket to Baaaaarf Wed: Thinking of doing a list experiment? Here’s a list of reasons why you should think again Thurs: An open site for researchers to post and share papers Fri: Questions about “Too Good to Be True” Sat: Sleazy sock puppet can’t stop spamming our discussion of compressed […]The post On deck this…

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Inferring participation rates in service projects

April 21, 2014
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Inferring participation rates in service projects

About a week ago I taught my tutorial, Bayesian Statistics Made Simple, at PyCon 2014 in Montreal.  My slides, the video, and all the code, are on this site.  The turnout was great.  We had a room full of enthusiastic Pythonistas who are...

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Habits are hard to shake off

April 21, 2014
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Habits are hard to shake off

For those who don't use an iPhone, what you are staring at is the new keyboard. Is the SHIFT key on or off? For most of us who use the iPhone, we can't tell you either. It's been confusing and...

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On Kaggle Forecasting Competitions, Part 1: The Hold-Out Sample(s)

April 21, 2014
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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 mo...

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Local functions (not!) in the SAS/IML language

April 21, 2014
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Local functions (not!) in the SAS/IML language

I have previously written about the scope of local and global variables in the SAS/IML language. You might wonder whether SAS/IML modules can also have local scope. The answer is no. All SAS/IML modules are known globally and can be called by any other modules. Some object-oriented programming languages support […]

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