Posts Tagged ‘ computing ’

Fixing aberrant files using R and the shell: a case study

April 7, 2011
By
Fixing aberrant files using R and the shell: a case study

Once in a while, you embark on what looks like a simple computational procedure only to encounter frustration very early on. “I can’t even read my file into R!” you cry. Step back, take a deep breath and take note of what the software is trying to tell you. Most times, you’ve just missed something

Read more »

What is R, really?

March 31, 2011
By
What is R, really?

On CRAN, the official web home of all things R it says, R is a free software environment for statistical computing and graphics. Well, that sounds all hunky dory. But let’s take a close look at what this statement really … Continue reading →

Read more »

RStudio: just what I’ve been looking for

February 28, 2011
By
RStudio: just what I’ve been looking for

For many years I used RWinEdt as my text editor for R code, but when WinEdt 6.0 came out, RWinEdt stopped working. So I’ve been looking for something to replace it. I’ve tried Tinn-R, NppToR, Eclipse with StatET and a couple of other editors, but nothing was quite right. Then yesterday, out of the blue,

Read more »

The RStudio IDE: first impressions are positive

February 28, 2011
By
The RStudio IDE: first impressions are positive

Integrated development environments (IDEs) are software development tools, providing an interface that enables you to write, debug, run and view the output of your code. Whether you need an IDE or find them useful depends very much on your own preferences and style of working. In my own case for example, I’ve tried both Eclipse

Read more »

Dataset: Wisconsin Union Protester Tweets #wiunion

February 21, 2011
By
Dataset: Wisconsin Union Protester Tweets #wiunion

   I’ve been playing with Twitter data over the last week, archiving Algerian, Egyptian, Iranian, and Chinese tweets.  I thought I’d bring the story a little closer to home this time by archiving tweets from Wisconsin Union protesters on the … Continue reading →

Read more »

Dataset: Tweets from the Chinese Protests #cn220

February 20, 2011
By
Dataset: Tweets from the Chinese Protests #cn220

  Earlier this week, I posted a ~100k tweet dataset on the #25bahman protests in Iran.  The corresponding figure of frequencies showed a strong presence on Twitter, with over 500 tweets per 5 minute period at peak.  You can download the … Continue reading →

Read more »

R Bloggers: The Site I Wish Existed in 2007

February 19, 2011
By
R Bloggers: The Site I Wish Existed in 2007

  My first experience with R was in 2007 as a sophomore in undergrad.  As part of a larger project on pricing day-ahead electricity futures, I wanted to cluster locational marginal price (LMP) data from the ISO-NE.  Something like k-means is easy … Continue reading →

Read more »

R programming books (updated)

January 28, 2011
By
R programming books (updated)

In a recent post, I asked for suggestions for introductory R computing books. In particular, I was looking for books that: Assume no prior knowledge of programming. Assume very little knowledge of statistics. For example, no regression. Are cheap, since they are for undergraduate students. Some of my cons aren’t really downsides as such. Rather,

Read more »

CPU and GPU trends over time

January 25, 2011
By
CPU and GPU trends over time

GPUs seem to be all the rage these days. At the last Bayesian Valencia meeting, Chris Holmes gave a nice talk on how GPUs could be leveraged for statistical computing. Recently Christian Robert arXived a paper with parallel computing firmly in mind. In two weeks time I’m giving an internal seminar on using GPUs for

Read more »

GLMM and R issues

December 4, 2010
By
GLMM and R issues

I have been trying to run a Generalized Linear Mixed Model (GLMM) for some count data with repeated measures on sub-sampled sites and fixed effects at the site level with covariates at both the sub-plot and time levels.  Plus there are different n...

Read more »