Monthly Archives: August 2011

Climate datasets in R

August 10, 2011
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As an ecologist working on climate change questions, I’ve always found it rather tedious to acquire and process climate data, especially when dealing with large spatiotemporal scales. Although many agencies provide free access to climate data, there is often some overhead (typically one to two days) before the data are made available for download via

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By: Build multiarch R (32 bit and 64 bit) on Debian/Ubuntu

<p> have the 64 bit version of R compiled from source on my Ubuntu laptop. I recently had a need for R based on 32 bit since a package I </p>

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Error : package does not have a name space

August 10, 2011
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Error : package does not have a name space

Here is a frustrating knot I am beginning to unravel. R has a namespace structure to help reduce errors resulting from functions, methods, objects, classes having the same name from two different packages. Makes sense. Those R objects that are … Continue reading →

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In case you missed it: July Roundup

August 10, 2011
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In case you missed them, here are some articles from July of particular interest to R users. A simulation in R finds the value (or disadvantage) or drawing an X, J, Q or Z in Scrabble. How to display high-quality graphics on the web using SVG output from R. A review of Paul Murrell's talk about raster image support...

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Bayes factors and martingales

August 10, 2011
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Bayes factors and martingales

A surprising paper came out in the last issue of Statistical Science, linking martingales and Bayes factors. In the historical part, the authors (Shafer, Shen, Vereshchagin and Vovk) recall that martingales were popularised by Martin-Löf, who is also influential in the theory of algorithmic randomness. A property of test martingales (i.e., martingales that are non

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SNA: Visualising an email box with R

August 10, 2011
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SNA: Visualising an email box with R

Are statistics sexy? Visualising social networks certainly is! I wrote a little function, which makes producing beautiful plots depicting a mailbox with R an extremely easy task. I find visualisations of ‘social graphs’ particularly appealing. They look like flowers. I … Continue reading →

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Dump MySQL to CSV using R

August 10, 2011
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Based on a related post on one of my favorite python-lists I remembered, that I wrote a similar snipplet some time ago. So if you want to dump your whole MySQL database to csv-files you can recycle the following code: ?Download mysql2cvs.R1 2 3 4 5 6 7 8 9 require(RMySQL) m<-MySQL() summary(m) con<-dbConnect(m, dbname

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Using the google prediction API from R

August 10, 2011
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Using the google prediction API from R

Google has a "black box" prediction API that they provide for use with creating recommender systems or filtering spam. Furthermore, they provide an R package for interfacing that API, but try as I might I cannot get it to work under windows. Here are ...

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Plotting molecular properties for (sub)sets

August 10, 2011
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Plotting molecular properties for (sub)sets

For a toxicology paper we are writing up, I need to create a few plots showing how the toxic and non-toxic molecules differ (or not) with respect to a few molecular properties, such as logP or the molecular weight. The rcdk package provides all, of cou...

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A 60-second survey for R users

August 10, 2011
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I'm doing a little research to validate estimates of the size of the R user community. If you're an R user, please take a minute to complete this three-question survey on R usage at your organization. Thanks in advance. Revolution Analytics: R user base survey

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