Monthly Archives: July 2012

ggplot2 – much easier with JGR and Deducer

July 7, 2012
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ggplot2 – much easier with JGR and Deducer

In the last R-User meeting in Cologne, we had a discussion about using ggplot2 – and I gave a short introduction of how to use ggplot2 with JGR and Deducer. Basically, JGR is a Graphical User Interface for R, and Deducer is a kind of “data analysis plugin”, that also comes with a so-called “plot

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The R Journal Volume 4/1, June 2012

July 6, 2012
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As first reported by Paolo, the new R journal is out! You can Download the complete issue from here.  Refereed articles may be downloaded individually using the links below. Table of Contents Editorial 3   Contributed Research Articles   Analysing Seasonal Data  Adrian G Barnett, Peter Baker and Annette J Dobson 5 MARSS: Multivariate Autoregressive State-space...

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Three hours of pure soccer emotion, visualized with R

July 6, 2012
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Three hours of pure soccer emotion, visualized with R

The biggest prize in UK soccer, the Premier League Championship, is decided by a points system. Unlike most sports competitions, there's no final round or playoff series: once the regular round of games is complete, the team that has accumulated the most points (three for a win, and one for a draw) is the champion of English football. In...

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Soda vs. Pop with Twitter

July 6, 2012
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Soda vs. Pop with Twitter

One of the great things about Twitter is that it’s a global conversation anyone can join anytime. Eavesdropping on the world, what what! Of course, it gets even better when you can mine all this chatter to study the way humans live and interact. For example, how do people in New York City differ from those in Silicon Valley? We...

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Error metrics for multi-class problems in R: beyond Accuracy and Kappa

July 6, 2012
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Error metrics for multi-class problems in R: beyond Accuracy and Kappa

The caret package for R provides a variety of error metrics for regression models and 2-class classification models, but only calculates Accuracy and Kappa for multi-class models.  Therefore, I wrote the following function to allow caret:::train t...

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RSAP, Rook and ERP

RSAP, Rook and ERP

As I wrote in my blog Analytics with SAP and R (Windows version) we can use RSAP to connect to our ERP system and play with the data. This time I wanted of course, to keep exploring the capabilities of RSAP, but using something else. As everybody kno...

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Fix Overplotting with Colored Contour Lines

July 6, 2012
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Fix Overplotting with Colored Contour Lines

I saw this plot in the supplement of a recent paper comparing microarray results to RNA-seq results. Nothing earth-shattering in the paper - you've probably seen a similar comparison many times before - but I liked how they solved the overplotting...

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Interest Differencing: Folk Commonly Followed by Tweeting MPs of Different Parties

July 6, 2012
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Interest Differencing: Folk Commonly Followed by Tweeting MPs of Different Parties

Earlier this year I doodled a recipe for comparing the folk commonly followed by users of a couple of BBC programme hashtags (Social Media Interest Maps of Newsnight and BBCQT Twitterers). Prompted in part by a tweet from Michael [email protected] about generating an ESP map for UK politicians (something I’ve also doodled before – Sketching

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A practical introduction to garch modeling

July 6, 2012
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A practical introduction to garch modeling

We look at volatility clustering, and some aspects of modeling it with a univariate GARCH(1,1) model. Volatility clustering Volatility clustering — the phenomenon of there being periods of relative calm and periods of high volatility — is a seemingly universal attribute of market data.  There is no universally accepted explanation of it. GARCH (Generalized AutoRegressive … Continue reading...

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The R Journal Volume 4/1

July 6, 2012
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The R Journal Volume 4/1

The 'Summer edition' of the R Journal is out! Get it from here.

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