Monthly Archives: May 2010

What Social Network Analysis software do you use?

May 12, 2010
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What Social Network Analysis software do you use?

See a the poll here by Gabriel Rossman at Code and Culture. I voted for R and ‘igraph’. If you use R you are getting access to all the other wonderful things that come with R. Using specialized package, like Pajek, UCINET etc requires constant going back and forth between network software and some other

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Collect and Parse GPS (NMEA0183) Data in R

May 11, 2010
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I recently wrote a serial connection for R-2.11.0 so that I can communicate with serial devices, for example an old Garmin eTrex Legend. This GPS device is able to output NMEA0183 sentences to a standard serial port (4800,8,1,N). I hooked up the device and used the serial connection to collect some data using some R

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Sweave for Reproducible Research and Beatiful Statistical Reports

May 11, 2010
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Frank Harrell, chair of the Biostatistics department here at Vanderbilt, is giving a seminar entitled "Sweave for Reproducible Research and Beautiful Statistical Reports" tomorrow, Wednesday, May 12, 1:30-2:30pm, in the MRBIII Conference Room 1220. This tutorial covers the basics of Sweave and shows how to enhance the default output in various ways by using: latex methods for converting R...

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Number Formatting

May 11, 2010
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Number Formatting

I was discussing some subject with my kids - can't recall if it was in the realm of astronomy, computing, or moder economics. In any case, it involved large numbers. I fired up R to do a quick calculation:> 1000000000 / 1000The resulting answer was ...

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R Package ‘rms’ for Regression Modeling

May 11, 2010
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If you attended Frank Harrell's Regression Modeling Strategies course a few weeks ago, you got a chance to see the rms package for R in action. Frank's rms package does regression modeling, testing, estimation, validation, graphics, prediction, and ty...

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Webinar May 20: Introduction to Revolution R

May 11, 2010
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I'll be giving a live webinar on Thursday next week (May 20) titled Introduction to Revolution R. If you're new to the R world and wondering what you can do with R, this webinar is for you. I'll also be introducing some of the functionality unique to Revolution R included in our Revolution R Community (free to everyone) and...

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R function names, explained

May 11, 2010
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Why is the function to print out text in R named "cat"? Why is the function to delete objects called "rm"? Unless you have a background in Unix (or Linux) programming, some of R's command names can seem, well, a bit arcane. Jeromy Anglim explains the provenance of many of R's command names in this post: the details are...

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Beware of rogue header files (Bioconductor installation)

May 11, 2010
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Beware of rogue header files (Bioconductor installation)

Just a short note concerning a “gotcha”. As I have many times before, I opened an R console on my newly-upgraded (to lucid 10.04) Ubuntu machine, typed source(“http://bioconductor.org/biocLite.R”) and began a Bioconductor install with biocLite(). Only this time, I saw this: Error in dyn.load(file, DLLpath = DLLpath, ...) : unable to load shared library '/home/sau103/R/i486-pc-linux-gnu-library/2.11/affyio/libs/affyio.so':

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Putting Text in a Margin

May 10, 2010
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Putting Text in a Margin

I found text and title early on but was initially confounded when trying to add text outside of an actual chart. As it turns out, I needed to understand a bit about R's concept of margins in a chart> par(oma=c(2,2,2,2))> plot(rnorm)> mtext('The label'...

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String Concatenation in R

May 10, 2010
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String Concatenation in R

String concatenation is a rather basic function - but my particular programming reflexes did not help me figure out how to do this in R. I tried the + and & operator, and even the || operator to no avail. Also tried concat() function... no dice. ...

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