September 2012

A Return to Reliable R

September 5, 2012 | inkhorn82

The saga with Statistica continues: Statistica kept crashing on me while doing my data processing.  One of the big problems was a wonderful bug that occurred when some of my text data variables were coded (unsurprisingly) as text!  Under this … Continue reading → [Read more...]

Style your ggplot2 charts with Themes

September 5, 2012 | David Smith

An update to the ggplot2 "grammar of graphics" package for R is now available on CRAN. This version introduces "Themes" for ggplot2 charts, and makes it possible to define and re-use your own preferences for title fonts and sizes, tick marks, grid color, etc. The system is heirarchically defined, so ... [Read more...]

Near-instant high quality graphs in R

September 5, 2012 | Thom

One of the main attractions of R (for me) is the ability to produce high quality graphics that look just the way you want them to. The basic plot functions are generally excellent for exploratory work and for getting to know your data. Most packages have additional functions for appropriate ... [Read more...]

BMS 0.3.1 Released

September 5, 2012 | BMS Add-ons » BMS Blog

Version 0.3.1 of the BMS package for Bayesian Model Averaging has been released. This is a maintenance release for compliance with recent CRAN guidelines. The BMS package therefore is again available on CRAN in addition to bms.zeugner.eu. Changes with... [Read more...]

Thalesians, and other events

September 5, 2012 | Pat

Featured Thalesians, London 2012 September 12. Chia Tan on “Practical Financial Modeling”. Abstract: Financial modelling is not a competition in the mastery of complexity. Rather, the aim is to come up with the simplest models adequate to capture salient market features of traded products. There exists a wide gulf between material covered ...
[Read more...]

Kendall’s Tau

September 5, 2012 | Wesley

Kendall’s Tau This is an example of Kendall’s Tau rank correlation.  This is similar to Spearman’s Rho in that it is a non-parametric measure of correlation on ranks.  It is an appropriate measure for ordinal data and is fairly straight forward when there are no ties in ... [Read more...]

Amazing fMRI plots for everybody!

September 5, 2012 | FelixS

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 ... [Read more...]

How to create random binary matrices in R

September 4, 2012 | David Smith

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, ... [Read more...]

BMR: Bayesian Macroeconometrics in R

September 4, 2012 | diffuseprior

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, ... [Read more...]

RStudio is RStupendous

September 3, 2012 | Travis Hinkelman

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 ... [Read more...]

Installing RStan in Ubuntu

September 3, 2012 | The Ubuntu R Blog

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-... [Read more...]

Project Euler — problem 19

September 3, 2012 | Tony

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 → [Read more...]

A look at Bayesian statistics

September 3, 2012 | Pat

An introduction to Bayesian analysis and why you might care. Fight club The subject of statistics is about how to learn.  Given that it is about the unknown, it shouldn’t be surprising that there are deep differences of opinion on how to go about doing it (in spite of ... [Read more...]

Optimization

September 2, 2012 | Vincent Zoonekynd's Blog

Many problems in statistics or machine learning are of the form "find the values of the parameters that minimize some measure of error". But in some cases, constraints are also imposed on the parameters: for instance, that they should sum up to 1, or that at most 10 of them should be ... [Read more...]
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