Publications by Tal Galili
R: another nifty graph
Make sure to click on the image to see the large version. Code for this graph: Related To leave a comment for the author, please follow the link and comment on their blog: Statistics Blog » r. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here if you're looking to post or ...
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R frustration of the day
Whenever you take a 1 column slice of a matrix, that gets automatically converted into a vector. But if you take a slice of several columns, it remains a matrix. The problem is you don’t always know in advance how big the slice will be, so if you do this: You'll get an error if x is 1. This creates the worst kind of bug: an intermittent one th...
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Jeroen Ooms’s ggplot2 web interface – a new version released (V0.2)
Good news. Jeroen Ooms released a new version of his (amazing) online ggplot2 web interface: yeroon.net/ggplot2 is a web interface for Hadley Wickham’s R package ggplot2. It is used as a tool for rapid prototyping, exploratory graphical analysis and education of statistics and R. The interface is written completely in javascript, therefore ther...
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Repeated measures ANOVA with R (tutorials)
Repeated measures ANOVA is a common task for the data analyst. There are (at least) two ways of performing “repeated measures ANOVA” using R but none is really trivial, and each way has it’s own complication/pitfalls (explanation/solution to which I was usually able to find through searching in the R-help mailing list). So for future refere...
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“The next big thing”, R, and Statistics in the cloud
A friend just e-mailed me about a blog post by Dr. AnnMaria De Mars titled “The Next Big Thing”. In it Dr. De Mars wrote (I allowed myself to emphasize some parts of the text): Contrary to what some people seem to think, R is definitely not the next big thing, either. I am always surprised when people ask me why I think that, because to my ...
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An article attacking R gets responses from the R blogosphere – some reflections
In this post I reflect on the current state of the R blogosphere, and share my hopes for it’s future. * * * Background I am very grateful to Dr. AnnMaria De Mars for writing her post “The Next Big Thing”. In her post, Dr. De Mars attacked R by accusing it of being “an epic fail” (in being user-friendly) and “NOT the next big thing�...
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Parallel Multicore Processing with R (on Windows)
This post offers simple example and installation tips for “doSMP” the new Parallel Processing backend package for R under windows. * * * Update: The required packages are not yet available on CRAN, but until they will get online, you can download them from here: REvolution foreach windows bundle (Simply unzip the folders inside your R libra...
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The difference between “letters[c(1,NA)]” and “letters[c(NA,NA)]“
In David Smith’s latest blog post (which, in a sense, is a continued response to the latest public attack on R), there was a comment by Barry that caught my eye. Barry wrote: Even I get caught out on R quirks after 20 years of using it. Compare letters[c(12,NA)] and letters[c(NA,NA)] for the most recent thing that made me bang my head against ...
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How to upgrade R on windows – another strategy (and the R code to do it)
Update: In the end of the post I added simple step by step instruction on how to move to the new system. I STRONGLY suggest using the code only after you read the entire post. Background If you didn’t hear it by now – R 2.11.0 is out with a bunch of new features. After Andrew Gelman recently lamented the lack of an easy upgrade process for R...
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R is going to have a GUI to ggplot2! (by the end of this years google-summer-of-code)
I was delighted to see the following e-mail post from Dirk Eddelbuettel regarding the google-summer-of-code R google group: * * * Earlier today Google finalised student / mentor pairings and allocations for the Google Summer of Code 2010 (GSoC 2010). The R Project is happy to announce that the following students have been accepted: Colin Run...
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