2860 search results for "TwitteR"

Gamified

September 26, 2011
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Gamified

Barry Rowlingson gave an interesting talk at UseR 2011, “Why R-help must die!” He suggested the Q-and-A type sites Stack Overflow (on programming) and Cross Validated (on statistics), both part of Stack Exchange. An interesting feature of these sites is that, in addition to voting up and down on the questions and answers, one accrues

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Visualizing Sampling Distributions

September 25, 2011
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Visualizing Sampling Distributions

Teacher: “How variable is your estimate of the mean?” Student: “Uhhh, it’s not. I took a sample and calculated the sample mean. I only have one number.” Teacher: “Yes, but what is the standard deviation of sample means?” Student: “What do you mean means, I only have the one friggin number.” Statisticians have a habit

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craps 0.1

September 22, 2011
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craps 0.1

The following script simulates a craps game in R any number of iterations with any starting amount of cash and any maximum odds and running until the user is out of cash.  It assumes a specific betting strategy as explained … Continue reading →

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Handbook of Markov chain Monte Carlo

September 21, 2011
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Handbook of Markov chain Monte Carlo

At JSM, John Kimmel gave me a copy of the Handbook of Markov chain Monte Carlo, as I had not (yet?!) received it. This handbook is edited by Steve Brooks, Andrew Gelman, Galin Jones, and Xiao-Li Meng, all first-class jedis of the MCMC galaxy. I had not had a chance to get a look at

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Density exploration and Wang-Landau algorithms [with R package]

September 21, 2011
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Density exploration and Wang-Landau algorithms [with R package]

Hey, Since a new paper that I’ve co-written has appeared on arXiv, here is a quick post summarizing it. The paper is named: An Adaptive Interacting Wang-Landau Algorithm for Automatic Density Exploration and describes improvements over the Wang-Landau algorithm described … Continue reading →

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Climate Reference Network: package crn 1.0

September 20, 2011
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Climate Reference Network:  package crn 1.0

I’ve just finished and uploaded another climate data package for R. This one focuses on  CRN the climate Reference Network Here is their home page   The package for now is really simple, but all of the packages  I’m building are getting simpler. In the end ( whenever that is ) I think I’ll end

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About commercial publishers

September 19, 2011
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About commercial publishers

Julien Cornebise has pointed out a recent Guardian article. It is about commercial publishers of academic journals, mainly Elsevier, Springer, and Wiley, with a clear stand from its title: “Academic publishers make Murdoch look like a socialist“! The valuable argument therein is that academic publishers make hefty profits (a 40% margin for Elsevier!)

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rgdal + raster + RCurl = My next package

September 18, 2011
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rgdal + raster + RCurl = My next package

This package has been a long time in the making.  In the end it’s more of a data package than a functional package, but pulling all the pieces together required me to learn some really cool packages: raster ( which I already knew ) rgdal and RCurl.  I’ll provide a littel bit of an overview

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Datasets to Practice Your Data Mining

September 16, 2011
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Datasets to Practice Your Data Mining

There are many datasets available online for free for research use. Some of them are listed below. - The R Datasets Package: There are around 90 datasets available in the package. Most of them are small and easy to feed … Continue reading →

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R Fork Bomb

September 14, 2011
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R Fork Bomb

So maybe I’m a strange guy, but I think fork bombs are really funny.  What’s a fork bomb?  The basic premise is that you spawn a process that spawns a process that spawns a process…, ad infinitum. The most beautiful example of a fork bomb, and really one of the most beautiful lines of code

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