The answer is e, what was the question?!

February 11, 2016
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The answer is e, what was the question?!

A rather exotic question on X validated: since π can be approximated by random sampling over a unit square, is there an equivalent for approximating e? This is an interesting question, as, indeed, why not focus on e rather than π after all?! But very quickly the very artificiality of the problem comes back to

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Getting Started with Microsoft SQL Server on Azure

February 11, 2016
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Getting Started with Microsoft SQL Server on Azure

by Joseph Rickert If you are an R user and work for an enterprise where Microsoft SQL server is important, it is extremely helpful to have easy access to...

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Reverse Engineering with Correlated Features

February 11, 2016
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Reverse Engineering with Correlated Features

In econometric modeling, I usually have a problem with correlated features. A few weeks ago, I was discussing feature selection when features are correlated. This week, I was wondering about...

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Clustering French Cities (based on Temperatures)

February 11, 2016
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Clustering French Cities (based on Temperatures)

In order to illustrate hierarchical clustering techniques and k-means, I did borrow François Husson‘s dataset, with monthly average temperature in several French cities. > temp=read.table( + "http://freakonometrics.free.fr/FR_temp.txt", + header=TRUE,dec=",") We...

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Plot the new SVG R logo with ggplot2

February 11, 2016
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Plot the new SVG R logo with ggplot2

High resolution and SVG versions of the new R logo are finally available. I converted the SVG to WKT (file here) which means we can use it like we...

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A Tall Drink of Water

February 10, 2016
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A Tall Drink of Water

In a previous post, I used water consumption data from Utah’s Open Data Catalog to explore what kind of users consume the...

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The Unbereable Insolence of Prime Numbers or (Playing to be Ulam)

February 10, 2016
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The Unbereable Insolence of Prime Numbers or (Playing to be Ulam)

So rock me mama like a wagon wheel, rock me mama anyway you feel (Wagon Wheel, Old Crow Medicine Show) This is the third iteration of Hilbert curve. I...

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23 new R jobs from around the world (2016-02-10)

February 10, 2016
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23 new R jobs from around the world (2016-02-10)

This is the bi-monthly R-bloggers post (for 2016-01-25) for new R Jobs. To post your R job on the next post Just visit this link and post a new R job to the R community...

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Finding the K in K-means by Parametric Bootstrap

February 10, 2016
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Finding the K in K-means by Parametric Bootstrap

One of the trickier tasks in clustering is determining the appropriate number of clusters. Domain-specific knowledge is always best, when you have it, but there are a number of...

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In case you missed it: January 2016 roundup

February 10, 2016
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In case you missed them, here are some articles from January of particular interest to R users. Animated visualizations and analysis of data from NYC's municipal bike program, created...

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Analysis: Clinton backed by Big Money: Sanders by Small

February 10, 2016
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Analysis: Clinton backed by Big Money: Sanders by Small

This article examines FEC data in depth and finds what most people already know. Hillary Clinton's presidential bid is financed largely through a relatively small quantity...

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Craft httr calls cleverly with curlconverter

February 10, 2016
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Craft httr calls cleverly with curlconverter

When you visit a site like the LA Times’ NH Primary Live Results site and wish you had the data that they used to make the tables & visualizations...

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The Easiest Way to Learn ggplot2

February 10, 2016
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Learn how to produce meaningful and beautiful data visualizations with DataCamp’s ggplot2 course series. Be introduced to the principles of good visualizations and the grammar of graphics plotting...

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Data Visualization Course Notes

February 10, 2016
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Data Visualization Course Notes

...

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[R] Kenntnis-Tage 2016: Mastering the Digital Transformation with R and Analytics

February 10, 2016
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“Digital transformation is happening now.” This is not only the message of this year’s CeBIT, but also illustrates the actuality of digital change in the business environment. Data analysis...

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Clusters of Texts

February 10, 2016
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Clusters of Texts

Another popular application of classification techniques is on texmining (see e.g. an old post on French president speaches). Consider the following example,  inspired by Nobert Ryciak’s post, with 12 wikipedia pages,...

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Durban R Users Group Meetup: 24 February 2016 @ The Green Door

February 10, 2016
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We’re kicking off the inaugural meeting of the Durban R Users Group with a live video presentation by Andrie de Vries (Senior Programme Manager, R Community Projects at Microsoft...

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Clusters of (French) Regions

February 9, 2016
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Clusters of (French) Regions

For the data scienec course of tomorrow, I just wanted to post some functions to illustrate cluster analysis. Consider the dataset of the French 2012 elections > elections2012=read.table( "http://freakonometrics.free.fr/elections_2012_T1.csv",sep=";",dec=",",header=TRUE)...

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New Release of RStudio (v0.99.878)

February 9, 2016
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New Release of RStudio (v0.99.878)

We’re pleased to announce that a new release of RStudio (v0.99.878) is available for download now. Highlights of this release include: Support for registering custom RStudio Addins. R Markdown...

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An Introduction to Time Series with JSON Data

February 9, 2016
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An Introduction to Time Series with JSON Data

For this post, I wanted to take the data analysis process in a different direction. Normally, an R analysis starts with data from a comma-separated Excel file (.csv) or...

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EARL London 2016 – Call for Abstracts

February 9, 2016
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EARL London 2016 – Call for Abstracts

  We are pleased to announce a call for abstracts for presentations for this year’s London EARL (Effective Applications of the R Language) Conference – 13th – 15th September 2016...

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Using SVG graphics in blog posts

February 9, 2016
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Using SVG graphics in blog posts

My traditional work flow for embedding R graphics into a blog post has been via a PNG files that I upload online. However, when I created a 'simple' graphic...

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R User Groups in Poland

February 9, 2016
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R User Groups in Poland

by Przemyslaw Biecek The first meeting of R users in Poland took place in Wroclaw in 2008. It was a one-day conference with 27 participants and 6 talks. Today,...

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Databases in containers

February 8, 2016
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Databases in containers

A great number of readers reacted very positively to Nina Zumel‘s article Using PostgreSQL in R: A quick how-to. Part of the reason is she described an incredibly powerful...

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Package funModeling: data cleaning, importance variable analysis and model perfomance

February 8, 2016
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Package funModeling: data cleaning, importance variable analysis and model perfomance

Hi there :) This new package -install.packages("funModeling")- tries to cover with simple concepts common tasks in data science. Written like a short tutorial, its focus...

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Tutorial: Credit Card Fraud Detection with SQL Server 2016 R Services

February 8, 2016
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Tutorial: Credit Card Fraud Detection with SQL Server 2016 R Services

If you have a database of credit-card transactions with a small percentage tagged as fraudulent, how can you create a process that automatically flags likely fraudulent transactions in the...

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Data Exploration with Kaggle – R Tutorial

February 8, 2016
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Data Exploration with Kaggle – R Tutorial

Ever wonder where to begin your data analysis? Exploratory Data Analysis (EDA) is often the best starting point. Take the new hands-on course from Kaggle &  DataCamp

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flipsideR: Support for ASX Option Chain Data

February 8, 2016
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I previously wrote about some ad hoc R code for downloading Option Chain data from Google Finance. I finally wrapped it up into a package called flipsideR, which is...

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"Using R for Introductory Econometrics"

February 8, 2016
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"Using R for Introductory Econometrics"

Recently, I received an email from Florian Heiss, Professor and Chair of Statistics and Econometrics at the Henrich Heine University of Dusseldorf.He wrote:"I'd like to...

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