In a recent Guerrilla CaP Group discussion, Baron S. wrote:....BS__ Using gnuplot against the dataset I gave, I get BS__    sigma   0.0207163 +/- 0.001323 (6.385%) BS__    kappa   0.000861226 +/- 5.414e-05 (6.287%) The Gnuplot output includes the errors for each of the universal scalability law (USL) coefficients. A question about the magnitude of these errors ... [Read more...]

My first time at ACM Data Mining Camp was so awesome, that I was thrilled the make the trip up to San Jose for the November 2010 version. In July, I gave a talk at the Emerging Technologies for Online Learning Symposium conference with a faculty member in the Department of ... [Read more...]

I’m organizing a new R Users Group for the University of Utah and Research Park sponsored by the Study Design and Biostatistics Center. We welcome all to come. The first meeting will be dedicated to finding out what users needs and abilities are. We also welcome all skill levels. ... [Read more...]

A happy announcement Hello everyone. After playing around with the idea of extending R-bloggers to languages other then English, today I went a head and did it. The new [Read more...]

There are a number of useful functions in R that test the variable type or convert between different variable types. These can be used to validate function input to ensure that sensible answers are returned from a function or to ensure that the function doesn’t fail. Following on from ... [Read more...]

A huge mass of rock hurtling in from space could really make a mess of your weekend plans. So it's comforting to know that the world's astronomers are out there keeping an eye for any potential earth-grazers. See their discoveries over the past 30 years in this beautifully-designed animation: Earth crossers ... [Read more...]

The latest local R user group to join the fold is CinDay RUG, serving the Cincinnati/Dayton area in Ohio. The group was founded by Stu Rodgers, who decided to set it up after posting a query on LinkedIn and finding several other R users in the area. Even if ... [Read more...]

I mentioned recently that Forbes is seeking stories about R for a forthcoming issue. Well, the story will now be in the December issue (bumped up from the January issue), so be sure to get your post your stories about R to the Mean Business blog by November 17. Forbes: Names ... [Read more...]

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I've been playing with images recently, probably inspired from my trip in San Francisco. There was an exhibit at the De Young museum of fine arts with pieces borrowed from the Musée d'Orsay. I did not go to the exhibit because it is easy enough fo... [Read more...]

An exciting conference in Zurich next February, 02-05. (I think I will attend! And not for skiing reasons!) Latent Gaussian models have numerous applications, for example in spatial and spatio-temporal epidemiology and climate modelling. This workshop brings together researchers who develop and apply Bayesian inference in this broad model class. ... [Read more...]

“Fast, cheap, correct: Pick two.” Does this phrase apply to statistical matching algorithms? In the case of Optmatch, you can have all three. “Cheap” is easy: it is open source. You can download it for free. Today I’m going to explain how to make the matching process both faster ... [Read more...]

This post sets out how to calculate confidence intervals for correlations using R. Because I often get this question from people unfamiliar with R, it assumes no prior knowledge of R. Formulas Online Statsbookhas formulas for calculating the confiden... [Read more...]

The new version 0.2.9 of RcppArmadillo has been uploaded to CRAN. The only change is an update of the included Armadillo template library to version 0.9.92 which Conrad released this week. RcppArmadillo makes it easy to write highly efficient and hi... [Read more...]

Today is Veterans Day in the US, and Remembrance Day or Armistice Day elsewhere in the world. Whatever you know this day as, it's a day for remembering the sacrifices of those who served. Drew Conway has commemorated the day in a touching yet saddening way, by visualizing with R ... [Read more...]

You might recall we posted a couple of weeks ago this chart summarizing the times of the day Firefox users switch on Private Browsing mode: The chart, based on data from the Mozilla Test Pilot program tells an interesting story about the habits of Web users. But what other interesting ... [Read more...]

In the mixed effects regression for all 10 countries in the research I mentioned previously on this blog http://stevepowell99.posterous.com/which-parents-are-satisfied-with-their-childs, while school mean of "parents believing their represen... [Read more...]

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Mortgage rates have been at historic lows recently.  The rates are posted various places online along with simple mortgage calculators.  Such calculators illustrate the payment schedule for a mortgage based upon selected terms. But with less ... [Read more...]

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