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“…the chosen statistic needs to be a so-called sufficient statistic in that any information about the parameter of interest which is contained in the data, is also contained in the summary statistic.” Elise Jenningsa and Maeve Madigan arXived a paper on a new Python code they developed for implementing ABC-SMC, ... [Read more...]

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  Last few days to purchase your tickets for the UK’s biggest R Conference this year! On September 13th-15th at The Tower Hotel, London, the conference has 1 day of workshops which are selling up fast and 2 days of conference with … Continue reading → [Read more...]

The pretty pictures from my empirical software engineering book are now online, along with the 210 data sets and R code (330M). Plotting the number of data sets in each year shows that empirical software engineering has really taken off in the last 10 years (code+data). Around dozen or so confidential ... [Read more...]

A most interesting link I got when reading Le Monde, about MatLab proposing deep learning tools…Filed under: Books, pictures, R, Statistics, University life Tagged: deep learning, Le Monde, Matlab [Read more...]

As we continue to program in R, all of us would have inevitably encountered multiple errors or bugs in our code. Not all programming errors are created equal – Many of the errors we encounter are pretty straight-forward to deal with, with clear, unambiguous error messages that a little googling (or ... [Read more...]

How to use R to draw 3D scatterplots in Minecraft? Let’s see. Minecraft is a game about placing blocks and going on adventures (source). Blocks are usually placed by players but there are add-ons that allow to add/modify/remove blocks through external API. And this feature is being ... [Read more...]

The seventh update in the 0.12.* series of Rcpp just arrived on the CRAN network for GNU R as well as in Debian. This 0.12.7 release follows the 0.12.0 release from late July, the 0.12.1 release in September, the 0.12.2 release in November, the 0.12.3 release in January, the 0.12.4 release in March, the 0.12.5 release in May, ... [Read more...]

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Did you ever feel knowing exactly what you wanted, but couldn’t find it in a mountain of information? We know how you feel… As the mountain of R courses and tutorials continues to get bigger, we need smart tools to quickly find those that meet our needs best. So, ... [Read more...]

Introduction Saving your R dataframe to a .csv can be useful; being able to view the data all at once can help to see the bigger picture. Often though, multiple dataframes, all pieces of the same project, need to be viewed this way and related back to... [Read more...]

Next week will be the meeting of the German (and Swiss and Austrians) ecologists in Marburg and the organizing team launched a visualization contest based on spatial data of the stores present in the city. Nadja Simons and I decided to enter the contest, our idea was to link the ... [Read more...]

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Weak institutions and natural resource abundance are a recipe for civil conflict and the overexploitation of natural resources.  In our forthcoming paper with the title “Take what you can: property rights, contestability and conflict”, Samuel Marden and I present evidence from Brazil indicating that insecure property rights are a major ... [Read more...]

This post is the second part in the customer segmentation analysis. The first post focused on k-means clustering in R to segment customers into distinct groups based on purchasing habits. This post takes a different approach, using Pricipal Component Analysis (PCA) in R as a tool to view customer groups. ... [Read more...]

Writing a book is a sacrifice. It takes a lot of time, represents a lot of missed opportunities, and does not (directly) pay very well. If you do a good job it may pay back in good-will, but producing a serious book is a great challenge. Nina Zumel and I ... [Read more...]

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An R tutorial by D. M. Wiig This tutorial is posted as an embedded Word document. To view the document full screen click on the icon in the lower-right corner of the document window. My next post covering installing and using the Rcommander GUI will b... [Read more...]