Monthly Archives: September 2012

Amazing fMRI plots for everybody!

September 5, 2012
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Amazing fMRI plots for everybody!

Dear valued customer, it is a well-known scientific truth that research results which are accompanied by a fancy, colorful fMRI scan, are perceived as more believable and more persuasive than simple bar graphs or text results (McCabe & Castel, 2007; Weisberg, Keil, Goodstein, Rawson, & Gray, 2008). Readers even agree more with fictitious and unsubstantiated

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Interactive web graphs with R – Overview and googleVis tutorial

September 5, 2012
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Interactive web graphs with R – Overview and googleVis tutorial

Today I feel very lucky, as I have been invited to the Royal Statistical Society conference to give a tutorial on interactive web graphs with R and googleVis. I prepared my slides with RStudio, knitr, pandoc and slidy, similar to my Cambridge R talk. ...

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Merging Current Stock Quotes with Historical Prices

September 4, 2012
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Merging Current Stock Quotes with Historical Prices

I got a question last week about going from the backtest to the trading. For example, if our system is based on today’s close, we can approximate the close value by the price at say 3:30pm, determine the signal and still have time enter the trade. It is not perfect, but one of possible solutions.

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How to create random binary matrices in R

September 4, 2012
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It all started off as a simple question from Scott Chamberlain on Twitter: Make m x n matrix with randomly assigned 0/1 -> apply(m, c(1,2), function(x) sample(c(0,1),1)) -- Better/faster solution? #rstats — Scott Chamberlain (@recology_) August 28, 2012 The goal was to create a matrix with randomly selected binary elements, and a predetermined number of rows and columns, that...

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BMR: Bayesian Macroeconometrics in R

September 4, 2012
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BMR: Bayesian Macroeconometrics in R

The recently released BMR package, short for Bayesian Macroeconometrics with R, provides a comprehensive set of powerful routines that estimate Bayesian Vector Autoregression (VAR) and Dynamic Stochastic General Equilibrium (DSGE) models in R. The procedure of estimating both Bayesian VAR and DSGE models can represent a great computational burden. However, BMR removes a lot of

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omg lol brb txt l8r – Text Message Analysis, 2011-2012

September 3, 2012
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omg lol brb txt l8r – Text Message Analysis, 2011-2012

IntroductionI will confess, I don't really like texting. I communicate through text messages, because it does afford many conveniences, and occupies a sort of middle ground between actual conversation and email, but that doesn't mean that I like it. E...

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RStudio is RStupendous

September 3, 2012
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I am a sucker for beautiful applications (like the ggplot2 web tool mentioned here). The latest R-related application to catch my eye is RStudio. RStudio™ is a free and open source integrated development environment (IDE) for R. You can run it on your desktop (Windows, Mac, or Linux) or even over the web using RStudio

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Research support specialist position at Ryerson University

September 3, 2012
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The Ted Rogers School of Management at Ryerson University in Toronto has an opening for a research support specialist to assist with monitoring current research projects and to provide assistance with econometric/statistical analysis and training.Requi...

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Installing RStan in Ubuntu

September 3, 2012
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Based on RStan Getting Started R packages Assuming you have the most up to date version of R, the following packages need to be installed. This assumes you have the c2d4u PPA available. See here for more information. sudo apt-get install r-cran-...

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Project Euler — problem 19

September 3, 2012
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I’ve been working overtime last weekend. Although I suffered little from the Monday syndrome, I still need a break. So, I’m back to the Project Euler after days of Olympic data digging. Today, I’m gonna to solve the 19th problem. You are given the following … Continue reading →

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