Monthly Archives: May 2010

R 2.11.1 scheduled for May 31

May 21, 2010
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As announced by the R Core Team, the next update to R will be 2.11.1 to be released on May 31. Despite being a minor-minor version increment, this release is expected to sport at least one new feature: BIC (in package stats4) will work with multiple fitted models, like AIC does. There will also be some improvements to the...

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Tip of the day: Keep the console active in R Productivity Environment

May 21, 2010
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Jared Lander on Twitter asks: When I alt-tab into R Enterprise how do I make the #rstats console the active window by default. Now it goes to solution explorer. Revolution's crack Support engineer Stephen Weller offers this solution: The best way to do this is to right-click on the R-Console window and make it a 'Tabbed Document'....

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Random sudokus [p-values]

May 21, 2010
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Random sudokus [p-values]

I reran the program checking the distribution of the digits over 9 “diagonals” (obtained by acceptable permutations of rows and column) and this test again results in mostly small p-values. Over a million iterations, and the nine (dependent) diagonals, four p-values were below 0.01, three were below 0.1, and two were above (0.21 and 0.42).

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highlight 0.1-8

May 21, 2010
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I've pushed version 0.1-8 of highlight to CRAN. highlight is a syntax highlighter for R that renders R source code into some markup language, the package ships html and latex renderers but is flexible enough to handle other formats. Syntax highligh...

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ACM Transactions on Modeling and Computer Simulation

May 20, 2010
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ACM Transactions on Modeling and Computer Simulation

Pierre Lecuyer is the new editor of the ACM Transactions on Modeling and Computer Simulation (TOMACS) and he has asked me to become an Area Editor for the new area of simulation in Statistics. I am quite excited by this new Æditor’s hat, since this is a cross-disciplinary journal: The ACM Transactions on Modeling and

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R: A random walk though OOP land.

May 20, 2010
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If you are used to object oriented programing in a different language, the way R does things can seem a little strange and backwards. “proto” to the rescue. With this library you can simulate “normal” OOP. I found the examples for proto not so helpful, so to figure out how the package works I sent

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Load Testing Think Time Distributions

May 20, 2010
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Load Testing Think Time Distributions

One of my gripes about some commercial load testing tools is that they only provide a think time distribution (Z) that is equivalent to uniform variates in the client-script. If you want some other distribution, you have to code it and debug it yoursel...

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Calling all T-shirt designers

May 20, 2010
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Got design skills as well as R skills? The organizers of the useR! 2010 conference are looking for a design to be used on the conference T-shirts. Mango Solutions (who are sponsoring the T-shirt) will select the winner, but personally I'd give extra points for designs that use R itself -- it's been done before! R-statistics blog: useR-2010 is...

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Tutorial: Principal Components Analysis (PCA) in R

May 20, 2010
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Found this tutorial by Emily Mankin on how to do principal components analysis (PCA) using R. Has a nice example with R code and several good references. The example starts by doing the PCA manually, then uses R's built in prcomp() function to do the s...

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RcppArmadillo 0.2.0 (and 0.2.1)

With the Rcpp 0.8.0 release on Monday, Romain, Doug and I were able to follow-up with a new RcppArmadillo release. RcppArmadillo uses Rcpp (and a few dozen lines of 'glue') to provide a transparent interface from R to Conrad Sanderson's impressive Arm...

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