R

Blogs on the R software.

Next Kölner R User Meeting: Friday, 6 March 2014

March 3, 2015
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Next Kölner R User Meeting: Friday, 6 March 2014

The next Cologne R user group meeting is scheduled for this Friday, 6 March 2014 and we have an exciting agenda with two talks, followed by networking drinks:Using R in Excel via R.NETGünter Faes and Matthias SpixMS Office and Excel are the 'de-facto'...

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Should I use premium Diesel? Setup

March 1, 2015
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Should I use premium Diesel? Setup

Since I drive quite a lot, I have some interest in getting the most km out every Euro spent on fuel. One thing to change is the fuel. The oil companies have a premium fuel, which is supposed to be better for both engine and fuel consumption. On the oth...

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Playing around with #rstats twitter data

February 28, 2015
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Playing around with #rstats twitter data

As a bit of weekend fun, I decided to briefly look into the #rstats twitter data that Stephen Turner collected and made available (thanks!). Essentially, this data set contains some basic information about over 100,000 tweets that contain the hashtag… Continue reading →

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Career NBA: The Road Least Traveled

February 27, 2015
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Career NBA: The Road Least Traveled

The bell rings - time to go to practice. Jarnell Stokes heads over to the gym, changes, and starts warming up with his teammates. It's his Junior year in high school. The Memphis, Tennessee native has a lot on his mind; soon he'll have to mak...

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R: How to Layout and Design an Infographic

February 26, 2015
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R: How to Layout and Design an Infographic

As promised from my recent article, here's my tutorial on how to layout and design an infographic in R. This article will serve as a template for more infographic design that I plan to share on future posts. Hence, we will go through the following sect...

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Minimal examples help

February 24, 2015
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Minimal examples help

The other day I got stuck working with a huge data set using data.table in R. It took me a little while to realise that I had to produce a minimal reproducible example to actually understand why I got stuck in the first place. I know, this is the mantr...

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Hadoop and Neo4j

February 23, 2015
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Hadoop and Neo4j

Hadoop is being widely used for processing big data and Neo4j is a popular open-source graph database. When doing social network analysis on big data, a “natural” thought is to use them together. Unfortunately, Neo4j cannot work directly on HDFS … Continue reading →

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Priors on odds and probability of success

February 22, 2015
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Priors on odds and probability of success

In Bayesian Approaches to Clinical Trials and Health-Care Evaluation (David J. Spiegelhalter, Keith R. Abrams, Jonathan P. Myles) they mention that an non informative prior should be uniform over the range of interest. They combine this with the d...

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amazing Gibbs sampler

February 18, 2015
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amazing Gibbs sampler

When playing with Peter Rossi’s bayesm R package during a visit of Jean-Michel Marin to Paris, last week, we came up with the above Gibbs outcome. The setting is a Gaussian mixture model with three components in dimension 5 and the prior distributions are standard conjugate. In this case, with 500 observations and 5000 Gibbs […]

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Making an app as a Valentine’s day gift

February 18, 2015
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Making an app as a Valentine’s day gift

For the past year, my girlfriend, Priya has been working on an awesome nonprofit called Tulalens. The idea is to be “yelp for low-income people in emerging markets”. She did a pilot in October/November 2014 where she and the Tulalens team went in...

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