Eurovision Tracker: the Twitter Buzz and Conversations per Country

June 5, 2013
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Eurovision Tracker: the Twitter Buzz and Conversations per Country

Eurovision Tracker [brandwatch.com] by social analytics company Brandwatch provides a visual overview of the Twitter buzz during the live Eurovision final that took place on 18th May. In this streamgraph visualization, each colored stream represent...

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The Frisch–Waugh–Lovell Theorem for Both OLS and 2SLS

June 5, 2013
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The Frisch–Waugh–Lovell Theorem for Both OLS and 2SLS

The Frisch–Waugh–Lovell (FWL) theorem is of great practical importance for econometrics. FWL establishes that it is possible to re-specify a linear regression model in terms of orthogonal complements. In other words, it permits econometricians to partial out right-hand-side, or control, variables. This is useful in a variety of settings. For example, there may be cases […]

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A story of fake-data checking being used to shoot down a flawed analysis at the Farm Credit Agency

June 5, 2013
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Austin Kelly writes: While reading your postings [or here] on the subject of testing your model by running fake data I was reminded of the fact that I got one of these kinds of tests actually published in a GAO report back in the day. Reading your posts on Unz and political vs. economic discourse [...]The post A story of fake-data checking being used to shoot down a flawed analysis…

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You sure, Mike?

June 5, 2013
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You sure, Mike?

Holly Baxter writes an interesting article on the Michael Douglas/HPV story (widely covered in the past few days: eg here, here or here) in today's Guardian, in which she basically tries to steal our thunder...  ;-) Holly argues tha...

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Cutting data won’t make cutting weight easier

June 5, 2013
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In my new book, I have a chapter on interpreting the statistics of obesity. Andrew Sullivan (link) recently pointed to a Nature article discussing an aspect of the controversy around these numbers. The bone of contention is the shape of the mortality curve. It has been thought that the curve is monotonic increasing, meaning that the higher your BMI, the higher the mortality rate. But survey data in the U.S.…

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Do CIs Avoid Fallacies of Tests? Reforming the Reformers (Reblog 5/17/12)

June 5, 2013
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Do CIs Avoid Fallacies of Tests?  Reforming the Reformers (Reblog 5/17/12)

The one method that enjoys the approbation of the New Reformers is that of confidence intervals. The general recommended interpretation is essentially this: For a reasonably high choice of confidence level, say .95 or .99, values of µ within the observed interval are plausible, those outside implausible. Geoff Cumming, a leading statistical reformer in psychology, has […]

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Using simulation to compute a power curve

June 5, 2013
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Using simulation to compute a power curve

Last week I showed how to use simulation to estimate the power of a statistical test. I used the two-sample t test to illustrate the technique. In my example, the difference between the means of two groups was 1.2, and the simulation estimated a probability of 0.72 that the t [...]

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New R Package for BEST (Bayesian ESTimation supersedes the t test)

June 5, 2013
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A completely re-packaged version of the BEST software (from the article, "Bayesian estimation supersedes the t test") has been prepared by Michael E. Meredith. Mike is a key member of the Wildlife Conservation Society in Malaysia. For his new R package...

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Daily bias in the mail

June 4, 2013
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David Spiegelhalter writes in his blog about this news headline on the Daily Mail (DM)'s website. According to the article, statins can weaken muscle and joints, raising the problem by up to 20%. As David points out, this claim is not justifi...

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Interrogating p-values

June 4, 2013
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Interrogating p-values

This article is a discussion of a paper by Greg Francis for a special issue, edited by E. J. Wagenmakers, of the Journal of Mathematical Psychology. Here’s what I wrote: Much of statistical practice is an effort to reduce or deny variation and uncertainty. The reduction is done through standardization, replication, and other practices of [...]The post Interrogating p-values appeared first on Statistical Modeling, Causal Inference, and Social Science.

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How old is the oldest person you know?

June 4, 2013
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How old is the oldest person you know?

Last week, we had a discussion with some colleagues about the fact that – in order to prepare for the SOA exams – we did not have time (so far) to mention results on extreme values in our actuarial program. I did gave an introduction in my nonlife actuarial models class, but it was only an introduction, in three hours, in order to illustrate reinsurance pricing. And I told my…

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Webinar: Managing Data with R

June 4, 2013
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Webinar: Managing Data with R

Before you can analyze data, it must be in the right form. Join Revolution Analytics and me this June 21st for a 4-hour webinar that shows how to perform the most commonly used data management tasks in R. We will work through … Continue reading →

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UseR 2013

June 4, 2013
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UseR 2013

Although the programme is quite interesting, I am not really involved in this conference (in fact I'm not even going $-$ even though, sometimes, I think it would be nice to spend the whole summer away at conferences!).But Vir has just put this pic...

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Value at Risk and Expected Shortfall, and other upcoming events

June 4, 2013
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Highlighted Value at Risk and Expected Shortfall A two-day course exploring Value at Risk and Expected Shortfall, and their role in risk management. 2013 June 25 & 26, London. Lead by Patrick Burns. Details at the CFP Events site. New Events Thalesians — San Francisco 2013 June 5. Jesse Davis on “Risk Model Imposed Manager-to-Manager … Continue reading →

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Interactive slides with googleVis on shiny

June 4, 2013
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Interactive slides with googleVis on shiny

Following on from last week's post, here are my slides on using googleVis on shiny from the Advanced R workshop at Lancaster University, 21 May 2013.googleVis on shinyAgain, I wrote my slides in RMarkdown and I used slidify to create the HTML5 pres...

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Boot

June 4, 2013
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Joshua Hartshorne writes: I ran several large-N experiments (separate participants) and looked at performance against age. What we want to do is compare age-of-peak-performance across the different tasks (again, different participants). We bootstrapped age-of-peak-performance. On each iteration, we sampled (with replacement) the X scores at each age, where X=num of participants at that age, and [...]The post Boot appeared first on Statistical Modeling, Causal Inference, and Social Science.

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Understanding U.S hospital billing practices – part 2 – chest pain

June 3, 2013
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Understanding U.S hospital billing practices – part 2 – chest pain

I have chest pain, but not because of what you might think. Although if it were that serious, I might go to the hospital and get it checked out. And the cost would vary wildly - depending upon where the hospital is located. And that's how you segu...

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random sudokus

June 3, 2013
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random sudokus

In a paper arXived on Friday, Roberto Fontana relates the generation of Sudoku grids to the one of Latin squares (which is unsurprising) and to maximum cliques of a graph (more surprising). The generation of a random Latin square proceeds in three steps: generate a random Latin square L with identity permutation matrix on symbol […]

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Is Quandl the easiest way to find and use numerical data on the internet?

June 3, 2013
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From: http://www.quandl.com/aboutQuandl has indexed over 5 million time-series datasets from over 400 sources. All of Quandl's datasets are open and free.You can download any Quandl dataset in any format that you want. You can also visualize, save, sha...

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The statistical properties of smart chains (and referral chains more generally)

June 3, 2013
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The statistical properties of smart chains (and referral chains more generally)

Louis Mittel writes: The premise of the column this guy is starting is interesting: Noah Davis interviews a smart person and then interviews the smartest person that smart person knows and so on. It reminded me of you mentioning survey design strategy of asking people about other people, like “How many people do you know [...]The post The statistical properties of smart chains (and referral chains more generally) appeared first…

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Maxima and minima

June 3, 2013
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Maxima and minima

Andrew Sullivan (link) highlights the insanity of the law with this "Chart of the Day", except that chart fails to bring out the message: For this data set, a Bumps-style chart works very well: *** The bar chart uses the...

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Passing values from PROC IML into SAS procedures

June 3, 2013
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Passing values from PROC IML into SAS procedures

A SAS user told me that he computed a vector of values in the SAS/IML language and wanted to use those values on a statement in a SAS procedure. The particular application involved wanting to use the values on the ESTIMATE and CONTRAST statements in a SAS regression procedure, but [...]

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A Few Tips for Writing an R Book

June 3, 2013
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A Few Tips for Writing an R Book

I just finished fixing (hopefully all) the problems in the knitr book returned from the copy editor. David Smith has kindly announced this book before I do. I do not have much to say about this book: almost everything in the book can be found in the on...

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