Monthly Archives: September 2012

More on fixed and random effects: Plotting and interpreting

September 7, 2012
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More on fixed and random effects: Plotting and interpreting

In a recent post I showed how plotting model fits can help to interpret higher-order polynomial terms. The key comparison there was between a model that did and did not have the higher order fixed effect terms. If you're going to use this strategy, you need to...

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Video: R, RStudio, Rcmdr & rattle

September 7, 2012
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I did a screencast for my co-workers to show how to get started with R, specifically what a base installation of R looks like, then showing how to improve your workflow using RStudio, Rcmdr or rattle.  The examples are somewhat … Continue reading →Video: R, RStudio, Rcmdr & rattle is an article from randyzwitch.com, a...

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Coming up: Two weeks of awesome guest bloggers

September 7, 2012
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I'm heading out on vacation to my Australian homeland for the next two weeks, but fear not reader friends: we have an awesome lineup of guest bloggers to fill in while I'm away. I don't want to ruin the surprise, but you'll be seeing posts from: experts in data visualization about how they use R; members of the R...

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ggplot2 0.9.2 has been released!

September 7, 2012
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ggplot2 0.9.2 has been released!

The main changes in this version are to the theming system. There are also a number of enhancements to the theming system that make it easier to modify themes and we’ve renamed a number of functions to have more informative names. Your existing code should continue to work, although you may receive warnings about functions

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Conversion of Meucci’s MatLab Code

September 7, 2012
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Conversion of Meucci’s MatLab Code

You might remember a second proposal I put forward for this summer’s Google Summer of Code (GSoC). This project was ambitious, looking to convert a subset of Attillio Meucci’s MatLab code to R. Thankfully, Brian Peterson took the lead mentor position for this particular project. Coincidently, the day before GSoC started we received a very

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That damn R-squared !

September 7, 2012
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That damn R-squared !

Another post about the R-squared coefficient, and about why, after some years teaching econometrics, I still hate when students ask questions about it. Usually, it starts with "I have a _____ R-squared... isn't it too low ?" Please, feel free to fi...

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Topic Modeling 1: Simulated LDA Corpus

September 6, 2012
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Because I am self-taught in many of the areas of computer science and more advanced statistics and probability theory I am most interested in, and because I have a deep aversion both to looking foolish and being full of it...

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Add Text Annotations to ggplot2 Faceted Plot (an easier approach)

September 6, 2012
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Add Text Annotations to ggplot2 Faceted Plot (an easier approach)

I recently posted a blog about adding text to a ggplot2 faceted plot (LINK). I was unhappy with the amount of time it takes to create the text data frame to then label the plot. And then yesterday when the … Continue reading →

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RcppArmadillo 0.3.4.0

September 6, 2012
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A new major released of Armadillo came out earlier today. I prepared the corresponding RcppArmadillo package 0.3.4.0 which also arrived on CRAN earlier today. This released contains a few performance improvements, the beginnings of support of sparse matrices and more, see below. We also post the NEWS entry for the beta release which was prepared, but not uploaded to CRAN to...

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Kickstarter facilitates $50M in indie game funding

September 6, 2012
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Kickstarter facilitates $50M in indie game funding

The social crowdfunding site Kickstarter announced today that it has enabled, via community contributions, $50M in funding in 2012 for new indie games. The second largest category of funding was for independent films. The blog post announcing the news includes analysis (using R, natch) of the breakdown in categories and funding sources. On a personal note, two Kickstarter projects...

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