How students can improve their final grade without studying even more

December 15, 2014
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Cross-post on my two blogs Here is something different: I wrote a piece on exam-taking tips. It's on a new website, Cafe, which has lots of good (non-quant) reads. The motivation for the piece is my observation that most American students are not taught how to take exams. As a professor, I notice that many students get lower scores than they deserve because of this. In this article, I describe…

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Elementwise minimum and maximum operators

December 15, 2014
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Elementwise minimum and maximum operators

Like most programming languages, the SAS/IML language has many functions. However, the SAS/IML language also has quite a few operators. Operators can act on a matrix or on rows or columns of a matrix. They are less intuitive, but can be quite powerful because they enable you perform computations without […]

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Experient downdating algorithm for Leave-One-Out CV in RDA

December 15, 2014
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Experient downdating algorithm for Leave-One-Out CV in RDA

In this post, I want to demonstrate a piece of experiment code for downdating algorithm for Leave-One-Out (LOO) Cross Validation in Regularized Discriminant Analysis [1]. In LOO CV, the program needs to calculate the inverse of \(\hat{\Sigma}_{k\v}(\la...

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Control Excel via SAS DDE & Python win32com

December 15, 2014
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Control Excel via SAS DDE & Python win32com

Excel is probably the most used interface between human and data. Whenever you are dealing with business people, Excel is the de facto means for all things about data processing. I used to only use SAS and Python for number crunching but in one of my r...

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A time series classification contest

December 14, 2014
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A time series classification contest

Amongst today’s email was one from someone running a private competition to classify time series. Here are the essential details. The data are measurements from a medical diagnostic machine which takes 1 measurement every second, and after 32–1000 seconds, the time series must be classified into one of two classes. Some pre-classified training data is […]

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The latest episode in my continuing effort to use non-sports analogies

December 14, 2014
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In a unit about the law of large numbers, sample size, and margins of error, I used the notorious beauty, sex, and power example: A researcher, working with a sample of size 3000, found that the children of beautiful parents were more likely to be girls, compared to the children of less-attractive parents. Can such […] The post The latest episode in my continuing effort to use non-sports analogies appeared…

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Sunday data/statistics link roundup (12/14/14)

December 14, 2014
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A very brief analysis suggests that economists are impartial when it comes to their liberal/conservative views. That being said, I'm not sure the regression line says what they think it does, particularly if you pay attention to the variance around the line (via Rafa). I am digging the simplicity of charted.co from the folks at Medium.

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The Rotterdam Model

December 14, 2014
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The Rotterdam Model

Ken Clements (U. Western Australia) has sent me a copy of his paper, co-authored with Grace Gao this month, "The Rotterdam Demand Model Half a Century On". How appropriate it is to see this important landmark in econometrics honoured in this way. ...

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How to take exams

December 14, 2014
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Here is something different: I wrote a piece on exam-taking tips. It's on a new website, Cafe, which has lots of good (non-quant) reads. The motivation for the piece is my observation that most American students are not taught how...

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I like the clever way they tell the story. It’s a straightforward series of graphs but the reader has to figure out where to click and what to do, which makes the experience feel more like a voyage of discovery.

December 14, 2014
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I like the clever way they tell the story.  It’s a straightforward series of graphs but the reader has to figure out where to click and what to do, which makes the experience feel more like a voyage of discovery.

Jonathan Falk asks what I think of this animated slideshow by Matthew Klein on “How Americans Die”: Please click on the above to see the actual slideshow, as this static image does not do it justice. What do I think? Here was my reaction: It is good, but I was thrown off by the very […] The post I like the clever way they tell the story. It’s a straightforward…

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Monthly Weather in Netherlands

December 14, 2014
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Monthly Weather in Netherlands

When I downloaded the KNMI meteorological data, the intention was to do something which takes more than just the computers memory. While it is clearly not big data, at the very least 100 years of daily data is not small either. So I took along a load o...

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When Did You Last Check Your Code?

December 13, 2014
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When Did You Last Check Your Code?

Chris Blattman (Columbua U.) has a blog directed towards international development, economics, politics, and policy.In a post yesterday, Chris asks: "What happens when a very good political science journal checks the statistical code of its submissions...

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S. Stanley Young: Are there mortality co-benefits to the Clean Power Plan? It depends. (Guest Post)

December 13, 2014
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S. Stanley Young: Are there mortality co-benefits to the Clean Power Plan? It depends. (Guest Post)

  S. Stanley Young, PhD Assistant Director Bioinformatics National Institute of Statistical Sciences Research Triangle Park, NC Are there mortality co-benefits to the Clean Power Plan? It depends. Some years ago, I listened to a series of lectures on finance. The professor would ask a rhetorical question, pause to give you some time to think, […]

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Don’t, don’t, don’t, don’t . . . We’re brothers of the same mind, unblind

December 13, 2014
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Don’t, don’t, don’t, don’t . . . We’re brothers of the same mind, unblind

Hype can be irritating but sometimes it’s necessary to get people’s attention (as in the example pictured above). So I think it’s important to keep these two things separate: (a) reactions (positive or negative) to the hype, and (b) attitudes about the subject of the hype. Overall, I like the idea of “data science” and […] The post Don’t, don’t, don’t, don’t . . . We’re brothers of the same…

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"The Error Term in the History of Time Series Econometrics"

December 12, 2014
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"The Error Term in the History of Time Series Econometrics"

While we're on the subject of the history of econometrics ......... blog-reader Mark Leeds kindly drew my attention to this interesting paper published by Duo Qin and Christopher Gilbert in Econometric Theory in 2001.I don't recall reading this pa...

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More on the History of Econometrics From Olav Bjerkholt

December 12, 2014
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More on the History of Econometrics From Olav Bjerkholt

If you look back at the various posts on this blog in the category of History of Econometrics, you'll find that I've often mentioned papers written by Olav Bjerkholt, of the University of Oslo.Olav has drawn my attention to two more recent papers of hi...

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Kobe, data says stop blaming your teammates

December 12, 2014
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Kobe, data says stop blaming your teammates

This year, Kobe leads the league in missed shots (by a lot), has an abysmal FG% of 39 and his team plays better when he is on the bench. Yet he blames his teammates for the Lakers' 6-16 record. Below is a plot showing that 2014 is not the first time the Lakers are mediocre during Kobe's

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Saying things that are out of place

December 12, 2014
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Saying things that are out of place

Basbøll points us to a column by Michael Shermer, a journalist and self-described skeptic who’s written a lot about skepticism, atheism, etc. Recently, though, Shermer wrote of an event that “shook [his] skepticism to its core”—it was a story about an old radio that didn’t work, then briefly started to work again, then stopped working. […] The post Saying things that are out of place appeared first on Statistical Modeling,…

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Light entertainment: a pie from the sky

December 12, 2014
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Light entertainment: a pie from the sky

Long time reader Chris P. finds another one. Is there a point when these parodies become stale? Link

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Next Generation Political Campaign Platform?

December 12, 2014
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Next Generation Political Campaign Platform?

[This post is by David K. Park] I’ve been imagining the next generation political campaign platform. If I were to build it, the platform would have five components: Data Collection, Sanitization, Storage, Streaming and Ingestion: This area will focus on the identification and development of the tools necessary to acquire the correct data sets for […] The post Next Generation Political Campaign Platform? appeared first on Statistical Modeling, Causal Inference,…

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New Features in EViews 9 (Beta)

December 11, 2014
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New Features in EViews 9 (Beta)

When you get a chance to check out the "beta" release of EViews 9 (which current users can download from here), you'll find lots of new features.Many of these relate to the Eviews interface, data handling, and graphs and tables. And then (of course) th...

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Two Non-Problems!

December 11, 2014
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Two Non-Problems!

I just love Dick Startz's "byline" on the EViews 9 Beta Forum: "Non-normality and collinearity are NOT problems!"Why do I like it so much? Regarding "normality", see here, and here. As for "collinearity": see here, here, here, and &...

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