Deriving distributions vs fitting distributions

October 21, 2013
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Sometimes you can derive a probability distributions from a list of properties it must have. For example, there are several properties that lead inevitably to the normal distribution or the Poisson distribution. Although such derivations are attractive, they don’t apply that often, and they’re suspect when they do apply. There’s often some effect that keeps […]

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Assign the diagonal elements of a matrix

October 21, 2013
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Assign the diagonal elements of a matrix

SAS/IML programmers know that the VECDIAG matrix can be used to extract the diagonal elements of a matrix. For example, the following statements extract the diagonal of a 3 x 3 matrix: proc iml; m = {1 2 3, 4 5 6, 7 8 9}; v = vecdiag(m); /* v = {1,5,9} [...]

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Tracking the 2013 Hurricane Season

October 21, 2013
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Tracking the 2013 Hurricane Season

With it nearing the end of hurricane season it’s only appropriate to do a brief summary of the activity this year.   It’s been a surprisingly low-key season as far as hurricanes are concerned.  There have been only a few hurricanes and the barometric pressure of any hurricane this season has not even come close […]

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Review: Isabel Meirelles, Design for Information

October 21, 2013
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Review: Isabel Meirelles, Design for Information

When I’m asked for a good book about visualization, I usually try to change the subject. There is no book I really love, they all have their issues. But thanks to Isabel Meirelles, I can now give a straight answer: Design for Information. In the interest of full disclosure: I was sent a free copy […]

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Follow up to Johnson et al Post

October 21, 2013
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Follow up to Johnson et al Post

Last week I posted a comment on a paper by Neil Johnson and colleagues that I now regret. The comment amounted to a bit of statistical pedantry on my part regarding some of the wording in the paper. It was my wording in this post, and specifically the title, which would have benefited from some […]

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machine learning [book review]

October 20, 2013
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machine learning [book review]

I have to admit the rather embarrassing fact that Machine Learning, A probabilistic perspective by Kevin P. Murphy is the first machine learning book I really read in detail…! It is a massive book with close to 1,100 pages and I thus hesitated taking it with me around, until I grabbed it in my bag […]

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How Do You Write Your Model Definitions?

October 20, 2013
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How Do You Write Your Model Definitions?

I’m often irritated by that when a statistical method is explained, such as linear regression, it is often characterized by how it can be calculated rather than by what model is assumed and fitted. A typical example of this is that linear regressio...

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Proving causation

October 20, 2013
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Proving causation

Aeroplanes cause hot weather In Christchurch we have a weather phenomenon known as the “Nor-wester”, which is a warm dry wind, preceding a cold southerly change. When the wind is from this direction, aeroplanes make their approach to the airport … Continue reading →

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The institution of tenure

October 20, 2013
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Rohin Dhar writes: The Priceonomics blog is doing a feature where we ask a few economists what they think of the the institution of tenure. If you’d be interested in participating, I’d love to get your response. As an economist, what do you think of tenure? Should it be abolished / kept / modified? My […]The post The institution of tenure appeared first on Statistical Modeling, Causal Inference, and Social…

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Bayesian Confirmation Philosophy and the Tacking Paradox (iv)*

October 20, 2013
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Bayesian Confirmation Philosophy and the Tacking Paradox (iv)*

*addition of note [2]. A long-running research program in philosophy is to seek a quantitative measure C(h,x) to capture intuitive ideas about “confirmation” and about “confirmational relevance”. The components of C(h,x) are allowed to be any statements, no reference to a probability model or to joint distributions are required. Then h is “confirmed” or supported […]

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R2jags & BCEA (& the examples from BMHE)

October 19, 2013
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Recently, Yu-Sung Su and Masanao Yajima, the developers of the R2jags package, have released a new version (the current one is 0.03-11). As far as I understand it, one of the main changes is that since the update, R2jags no longer depend...

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Waiting for Don’t Panic

October 19, 2013
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Waiting for Don’t Panic

‘Internationally acclaimed Swedish Professor Hans Rosling will present Don’t Panic – The Truth About Population, an ‘as-live’ studio event featuring …Continue reading →

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R package for effect size calculations for psychology researchers

October 19, 2013
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Dan Gerlanc writes: I read your post the other day [now the other month, as our blog is on a bit of a delay] on helping psychologists do research and thought you might be interested in our R package, “bootES”, for robust effect size calculation and confidence interval estimation using resampling techniques. The package provides […]The post R package for effect size calculations for psychology researchers appeared first on Statistical…

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Carry-over balanced designs for 8 treatments

October 19, 2013
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Those are Williams designs you might say, but it has become clear to me that Williams designs are just a subset of all carry-over balanced designs. Not through hard work of mine, comments by Apn on my previous post Creating Williams designs with e...

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Markdown or LaTeX?

October 19, 2013
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Markdown or LaTeX?

What happens if you ask for too much power from Markdown? R Markdown is one of the document formats that knitr supports, and it is probably the most popular one. I have been asked many times about the choice between Markdown and LaTeX, so I think ...

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Open sourcing movide, a student-centric learning platform

October 18, 2013
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Open sourcing movide, a student-centric learning platform

I haven’t blogged in a while, mostly because I have been trying to figure out what I should do next. One thing that I have been working on lately that I am very passionate about is Movide. Movide is a student-centric learning platform. You mig...

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Subsidies, Revenues, and Expenses of NCAA Division I Public Schools Athletic Departments – Visualizations using rCharts and animint generated interactive ggplots

October 18, 2013
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UPDATE: THE BLOG/SITE HAS MOVED TO GITHUB. THE NEW LINK FOR THE BLOG/SITE IS patilv.github.io and THE LINK TO THIS POST IS: http://bit.ly/1obVGLS. PLEASE UPDATE ANY BOOKMARKS YOU MAY HAVE.Two interesting articles in recent issues of The Atlantic linked...

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Trading Strategies Performance Report with R and Knitr

October 18, 2013
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Trading Strategies Performance Report with R and Knitr

I’ve been looking for template reports using R and Knitr for a while but I didn’t find anything that suits my needs so far. I therefore decided to create them myself. What I like to see about trading strategies are basic performance charts (daily, monthly and yearly), some basic trading statistics and above all most […]

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Open sourcing movide, a student-centric learning platform

October 18, 2013
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Open sourcing movide, a student-centric learning platform

I haven't blogged in a while, mostly because I have been trying to figure out what I should do next. One thing that I have been working on lately that I am very passionate about is Movide. Movide is a student-centric learning platform. You might yawn at this point and wonder why Movide matters. It's a natural reaction, given the crowded learning tools marketplace. Movide, matters, I think, because it…

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EP and ABC

October 18, 2013
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EP and ABC

Expectation propagation and approximate Bayesian computation. Here are X’s comments on a paper, “Expectation-Propagation for Likelihood-Free Inference,” by Simon Barthelme and Nicolas Chopin. The paper is not new but the topic is still hot. Also there’s this paper by Maurizio Filippone and Mark Girolami on computation for Gaussian process models. I wonder how this connects […]The post EP and ABC appeared first on Statistical Modeling, Causal Inference, and Social Science.

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Platforms and Integration in Statistical Research (Part 2/2)

October 18, 2013
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In my last post, I talked about two general approaches to conducting statistical research: platforms and integration. In this followup I thought I'd describe the characteristics of certain fields that suggesting taking one approach over another. I think in practice, … Continue reading →

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Rotating matrices

October 18, 2013
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Rotating matrices

This article is about rotating matrices. No, I don't mean "rotation matrices," I mean rotating matrices. As in turning a matrix 90 degrees in a clockwise or counterclockwise direction. I was reading a program written in MATLAB in which the programmer used a MATLAB function called ROT90, which rotates a [...]

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G+ hangout for Bayesian Data Analysis course now! (actually, in 5 minutes)

October 18, 2013
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Here’s the link. When you’re on the hangout, please mute your own microphone! I’ll have the computer point at the blackboard. You can follow along with the slides: for the first hour for the second hour P.S. Apparently there is some limit on number of hangout participants (see comments). I didn’t know about that! Maybe […]The post G+ hangout for Bayesian Data Analysis course now! (actually, in 5 minutes) appeared…

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