February 2010

Eight R Video Tutorials on VCASMO

February 4, 2010 | 0 Comments

Download "Getting Started with the Social Media Analytics Research Toolkit" (pdf, 1.25 megabytes) Download the Social Media Analytics Research Toolkit Thanks to Drew Conway (@drewconway), a PhD student at New York University, there are now eight excell... [Read more...]

RProtoBuf: protocol buffers for R

February 4, 2010 | 0 Comments

We (Dirk and I) released the initial version of our package RProtoBuf to CRAN this week. This packages brings google's protocol buffers to R I invite you to check out the main page for protobuf to find the language definition for protocol buffers ... [Read more...]

Mapping the Massachusetts election upset with R, ctd

February 4, 2010 | 0 Comments

Last week we looked at an analysis done in R by the good folks at Offensive Politics, looking at the political climate surrounding the recent Senate election in Massachusetts. There were some very insightful comments (thanks, Revolutions readers!) about the design of the charts, especially in the choice of color ... [Read more...]

RProtoBuf 0.1-0

February 3, 2010 | 0 Comments

Romain uploaded our first release of RProtoBuf to CRAN yesterday. RProtoBuf provides bindings for GNU R to the Google Protobuf implementation. Google Protobuf is (and I quote) a way of encoding structured data in an efficient yet extensible format th... [Read more...]

Three Must-Have Books on Data Visualization

February 3, 2010 | 0 Comments

Download "Getting Started with the Social Media Analytics Research Toolkit" (pdf, 1.25 megabytes) Download the Social Media Analytics Research Toolkit Disclosure As you probably know, I live in the Portland, Oregon area and have for many years. One of ... [Read more...]

One-way Analysis of Variance (ANOVA)

February 3, 2010 | 0 Comments

Analysis of Variance (ANOVA) is a commonly used statistical technique for investigating data by comparing the means of subsets of the data. The base case is the one-way ANOVA which is an extension of two-sample t test for independent groups covering situations where there are more than two groups being ...
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Advanced graphics in R – links to slides and code

February 3, 2010 | 0 Comments

A lot of attention recently has gone to the more modern (and, dare I say, sexier) graphics systems in R, ggplot2 and lattice. But there's a lot of power in the base graphics system built into core R, especially when you want control over every aspect of how the graph ... [Read more...]

The Power to … What did you say?

February 2, 2010 | 0 Comments

It is just about a year ago (exactly January 6th, 2009) that a New York Times article on R did fuel the dispute on what statistical analysis tool is “the best”. One of the highlight of the article was a quote from SAS’ Anne H. Milley: “I think it addresses a ... [Read more...]

Ensemble Prediction

February 2, 2010 | 0 Comments

Weather is unpredictable. Small differences in initial conditions can develop into big differences in the pattern of circulation, in the timing and location of cyclones, rainfall etc. This is true no matter how good the initial observing system is. The approach taken by organisations such as ECMWF or NCEP is ... [Read more...]

InfoWorld: SAS and SPSS rise to R opportunity

February 1, 2010 | 0 Comments

At InfoWorld's "Open Source" blog Salvio Rodrigues found R co-inventor Robert Gentleman's appointment to the REvolution Computing board "a great impetus for me to look at R again". He notes that both SAS and SPSS have recognized the opportunity presented by R: I suspect that SPSS and SAS made their ... [Read more...]

R Tutorial Series: Regression With Categorical Variables

February 1, 2010 | 0 Comments

Categorical predictors can be incorporated into regression analysis, provided that they are properly prepared and interpreted. This tutorial will explore how categorical variables can be handled in R.Tutorial FilesBefore we begin, you may want to download the sample data (.csv) used in this tutorial. Be sure to right-click and ... [Read more...]
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