Monthly Archives: September 2012

RStudio is RStupendous

September 3, 2012
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I am a sucker for beautiful applications (like the ggplot2 web tool mentioned here). The latest R-related application to catch my eye is RStudio. RStudio™ is a free and open source integrated development environment (IDE) for R. You can run it on your desktop (Windows, Mac, or Linux) or even over the web using RStudio

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Research support specialist position at Ryerson University

September 3, 2012
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The Ted Rogers School of Management at Ryerson University in Toronto has an opening for a research support specialist to assist with monitoring current research projects and to provide assistance with econometric/statistical analysis and training.Requi...

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Installing RStan in Ubuntu

September 3, 2012
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Based on RStan Getting Started R packages Assuming you have the most up to date version of R, the following packages need to be installed. This assumes you have the c2d4u PPA available. See here for more information. sudo apt-get install r-cran-...

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Project Euler — problem 19

September 3, 2012
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I’ve been working overtime last weekend. Although I suffered little from the Monday syndrome, I still need a break. So, I’m back to the Project Euler after days of Olympic data digging. Today, I’m gonna to solve the 19th problem. You are given the following … Continue reading →

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A look at Bayesian statistics

September 3, 2012
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A look at Bayesian statistics

An introduction to Bayesian analysis and why you might care. Fight club The subject of statistics is about how to learn.  Given that it is about the unknown, it shouldn’t be surprising that there are deep differences of opinion on how to go about doing it (in spite of the stereotype that statisticians are accountants … Continue reading...

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Fixing non positive definite correlation matrices using R

September 3, 2012
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Problem When a correlation or covariance matrix is not positive definite (i.e., in instances when some or all eigenvalues are negative), a cholesky decomposition cannot be performed. Sometimes, these eigenvalues are very small negative numbers and occ...

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Descriptive statistics of some Agile feature characteristics

September 2, 2012
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Descriptive statistics of some Agile feature characteristics

The purpose of software engineering research is to figure out how software development works so that the software industry can improve its quality/timeliness (i.e., lower costs and improved customer satisfaction). Research is hampered by the fact that companies are not usually willing to make public good quality data about the details of their software development

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Faster creation of binomial matrices

September 2, 2012
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Scott Chamberlain blogged about faster creation of binomial matrices the other day, and even referred to our RcppArmadillo package as a possible solution (though claiming he didn't get it to work, tst tst -- that is what the rcpp-devel list is here to help with). The post also fell short of a good aggregated timing comparison for which we love...

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Stan

September 2, 2012
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Stan

Andrew Gelman has announced the release of Stan version 1.0.0 and its R interface RStan.  Stan – named after Stanislaw Ulam, the inventor of the Monte Carlo method – is a new MCMC program that represents a major technological leap … Continue reading →

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Call for contribution: the RDataMining package – an R package for data mining

September 2, 2012
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Call for contribution: the RDataMining package – an R package for data mining

Join the RDataMining project to build a comprehensive R package for data mining http://www.rdatamining.com/package We have started the RDataMining project on R-Forge to build an R package for data mining. The package will provide various functionalities for data mining, with … Continue reading →

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