Monthly Archives: April 2010

R Project and Google Summer of Code: Welcome to our students!

April 26, 2010
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A few hours ago, I sent the following to both the R development list and the informal R / GSoC list: Date: Mon, 26 Apr 2010 15:27:29 -0500 To: R Development List CC: gsoc-r Subject: R and the Google Summer of Code 2010 -- Please welcome our new stud...

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R Project and Google Summer of Code: Welcome to our students!

April 26, 2010
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A few hours ago, I sent the following to both the R development list and the informal R / GSoC list: Date: Mon, 26 Apr 2010 15:27:29 -0500 To: R Development List CC: gsoc-r Subject: R and the Google Summer of Code 2010 -- Please welcome our new st...

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R is going to have a GUI to ggplot2! (by the end of this years google-summer-of-code)

April 26, 2010
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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 Rundel, “rgeos – an...

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R Project websites down

April 26, 2010
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The main R Project website, www.r-project.org, many of the primary CRAN mirrors (including cran.r-project.org), and r-forge.r-project.org are currently unavailable following a power failure at the master host in Austria. The US CRAN mirror, cran.us.r-project.org, and other mirrors not under the r-project.org domain (including cran.revolution-computing.com) are still accessible. In addition, the following services are not affected: bugs.r-project.org, developer.r-project.org, ess.r-project.org, search.r-project.org,...

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A serial Connection for R

April 26, 2010
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***UPDATED: June 3, 2010 – revert name from “tty” to “serial“, R version (2.11.1)*** I’m working on a patch for R (currently 2.11.1) that adds a serial connection feature for POSIX systems (i.e. Linux, Mac OS X, …). The serial connection works like the other connections. For example, the following code opens, writes a single

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Example 7.34: Propensity scores and causal inference from observational studies

April 26, 2010
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Example 7.34: Propensity scores and causal inference from observational studies

Propensity scores can be used to help make causal interpretation of observational data more plausible, by adjusting for other factors that may responsible for differences between groups. Heuristically, we estimate the probability of exposure, rather t...

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R : NA vs. NULL

April 25, 2010
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R : NA vs. NULL

The R language has two closely related NULL-like values, NA and NULL ... Both are used to represent missing or undefined values. This has lead to much confusion.

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Summarising data using box and whisker plots

April 25, 2010
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Summarising data using box and whisker plots

A box and whisker plot is a type of graphical display that can be used to summarise a set of data based on the five number summary of this data. The summary statistics used to create a box and whisker plot are the median of the data, the lower and upper quartiles (25% and 75%)

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How to upgrade R on windows – another strategy (and the R code to do it)

April 23, 2010
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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...

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Some LaTeX Gems – Part 1: TikZ, Loops and more

April 23, 2010
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Some LaTeX Gems – Part 1: TikZ, Loops and more

This logo means that the blog post is about something I have found interesting, but does not apply directly to the exact purpose of this blog. Note: These commands have been tested in pdflatex. I am not sure if they work in other distributions. Over the past couple of months, I have been assisting with editing some papers and also doing...

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