Monthly Archives: March 2013

Using R: Correlation heatmap with ggplot2

March 21, 2013
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Using R: Correlation heatmap with ggplot2

Just a short post to celebrate that I learned today how incredibly easy it is to make a heatmap of correlations with ggplot2 (and reshape2, of course). So, what is going on in that short passage? cor makes a correlation matrix with all the pairwise correlations between variables (twice; plus a diagonal of ones). melt

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RMark: data.table merge vs core merge

March 21, 2013
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This is the third post concerning fast merging in R, first here and second here. This time we are going to look at how the merge function from data.table package works in our case, requested by Uwe Block. As a reminder the first post concerns doing a...

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R’s Garden of Probability Distributions

March 21, 2013
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R’s Garden of Probability Distributions

by Joseph Rickert If you type ?Distributions at the R console you get a list of the 21 probability distributions included in the stats package that ships with base R. The same list appears in the Introduction to R Manual on CRAN and in most of the many fine introductory books available for the R language. These are indeed...

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And so begins English Composition I

March 21, 2013
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And so begins English Composition I

This week started the English Composition I: Achieving Expertise course (Comer, 2013) that I have been looking forward to. I am not sure yet how long I will last, but I hope to enjoy it as much as I can. Plus, it should help me with my...

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Video: High scale in-database modeling in Greenplum with R

March 20, 2013
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Video: High scale in-database modeling in Greenplum with R

The following post presents the video of a talk by Hong Ooi who presented at Melbourne R Users, March 2013. Content: Greenplum is a massively parallel relational database platform. R is one of the top languages in the data scientist/applied … Continue reading →

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RserveCLI2, a .net client for Rserve

March 20, 2013
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RserveCLI is a .net/cli client for Rserve, created by Oliver M. Haynold. Oliver has done a great job with this project. I forked this project to add features, fix bugs, and do some restructuring. I thought it was a significant enough depature to cre...

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NCAA Basketball Visualization

March 20, 2013
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NCAA Basketball Visualization

It is time for the NCAA Basketball Tournament. Sixty-four teams dream big (er…I mean 68…well actually by now, 64) and schools like Iona and Florida Gulf Coast University (go Eagles!) are hoping that Robert Morris astounding victory in the N.I.T. … Continue reading →

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Normalized Frequency of Terrorism in the US

March 20, 2013
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Normalized Frequency of Terrorism in the US

I’ve been using the Global Terrorism Database a lot lately so I decided to share an interesting plot I made with the data. The GTD provides over 100,000 observations of terrorist incidents between 1970 and 2011. Of these, there are about 2400 observations in the USA. While this is not a large number, the graph still provides some interesting...

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Find the fairest place to meet on the Paris Métro

March 20, 2013
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Find the fairest place to meet on the Paris Métro

When I lived in Paris years ago, I worked near Gare du Nord, but my friend Jenny lived near République. If we wanted to meet up after work, we'd just meet halfway along the Orange Métro line, around Gare de l'Est. Easy. Since that's within walking distance we wouldn't actually take the Métro, but Métro stations are useful waypoints...

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Violin plots and regional income distribution

March 20, 2013
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Violin plots and regional income distribution

While preparing my slides for statistical graphics, a plot really caught my eye when I was playing around with the data. I started off by plotting the time seriesof GNI per capita by country, and as expected it got quite messy and...

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