Monthly Archives: April 2011

Further Adventures in Visualisation with ggplot2

April 25, 2011
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Further Adventures in Visualisation with ggplot2

So I previously took a look at some data of player performance from a computer game. In this post, I’m going to do some further visualisations using ggplot2. The data consists of different types of player character, different roles for those characters, and their overall damage output (the unit here is damage per second, or

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RInside 0.2.4

April 25, 2011
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After several months, it was time for a new release 0.2.4 of RInside which is now on CRAN. RInside is a set of convenience classes which facilitate embedding of R inside of C++ applications and programs, using the classes and functions provided by th...

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Merging Multiple Data Files into One Data Frame

April 24, 2011
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Merging Multiple Data Files into One Data Frame

We often encounter situations where we have data in multiple files, at different frequencies and on different subsets of observations, but we would like to match them to one another as completely and systematically as possible. In R, the merge() comma...

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Merging Multiple Data Files into One Data Frame

April 24, 2011
By
Merging Multiple Data Files into One Data Frame

We often encounter situations where we have data in multiple files, at different frequencies and on different subsets of observations, but we would like to match them to one another as completely and systematically as possible. In R, the merge() comma...

Read more »

Of Height and Speed in Tennis, or Fuzziness and Techiness in College

April 24, 2011
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Of Height and Speed in Tennis, or Fuzziness and Techiness in College

I thought of this after reading this post and perhaps also this one, one the Cheap Talk blog. Here's the puzzle: in general, being tall does not make you slow; but among professional tennis players, the tall athletes do tend to be relativel...

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Kickstarter Data Analysis: Success and Pricing

April 24, 2011
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Kickstarter Data Analysis: Success and Pricing

Kickstarter is an online crowdfunding platform for launching creative projects. When starting a new project, project owners specify a deadline and the minimum amount of money they need to raise. They receive the money (less a transaction fee) only if they reach or exceed that minimum; otherwise, no money changes hands. What’s particularly fun about Kickstarter is...

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Chop, Slice and Dice Your Returns in R

April 24, 2011
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Chop, Slice and Dice Your Returns in R

I have a knife rack on my kitchen wall with all my kitchen knives easily identifiable and accessible. I also have small scars on my hand where each knife can claim to have left a mark. It's not the knife's fault, of course. They hardly like being sudde...

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RcppArmadillo 0.2.19

April 24, 2011
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Last Monday, Conrad Sanderson released version 1.2.10 of his most excellent Armadillo templated C++ library for linear algebra; I followed up the same day with version 0.2.19 of our RcppArmadillo wrapper for R based on our Rcpp library. However, the...

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Logistic Regression & Factors in R

April 24, 2011
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Logistic Regression & Factors in R

Factors are R's enumerated type. Suppose you define the variable cities -- a vector of strings -- whose possible values are "New York," "Paris," "London" and "Beijing." Instead of representing each city as a string of characters, you might prefer to ...

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Location Tracking on Android, too!

April 23, 2011
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Location Tracking on Android, too!

This week it was revealed that the iPhone stores users’ locations, and this immediately caused a huge firestorm of commentary by tech geeks, panic among privacy advocates, and delight to data geeks like myself. Even better/worse, it seems that the iPhone caches location traces long-term, possibly back to the date the phone was activated. I ditched my iPhone this past...

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