Monthly Archives: July 2011

Parallel JAGS RNGs

July 23, 2011
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As a matter of convention, we usually run 3 or 4 chains in JAGS. By default, this gives rise to chains that draw samples from 3 or 4 distinct pseudorandom number generators. I didn’t go and check whether it does things 111,222,333 or 123,123,123, but in any event the “parallel chains” in JAGS are samples

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RcppArmadillo 0.2.26 and 0.2.27

July 23, 2011
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Earlier this week, Conrad Sanderson issued a minor bug fix release 2.0.2 of his Armadillo library which provides templated C++ code for linear algebra. We wrapped that into a new RcppArmadillo release 0.2.26 and shipped it to CRAN. Due to it being su...

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Passing non-graphical parameters to graphical functions using …

July 23, 2011
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Passing non-graphical parameters to graphical functions using …

Argument passing via ... is a great feature of the R language, allowing you to write wrappers around existing functions that do not need to list all the arguments of the wrapped function. ... is used extensively in S3 methods … Continue reading →

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RomanM’s Method

July 22, 2011
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RomanM’s Method

I’ve succeeded in getting a version of RomanM and JeffId’s Thermal hammer working with version 1.3 of RghcnV3. This is going to be a long post because there is a lot of ground to cover. First, some errata, the “Globe” demo in V1.3 appears to have a missing line, looks like an editor bug, so

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Clustering U.S. Senators using roll call voting data

July 22, 2011
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Clustering U.S. Senators  using roll call voting data

For our forthcoming book on machine learning for hackers, John Myles White and I will discuss clustering, and various methods for doing so. One common method for clustering observations

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IBM Netezza: Embrace open source analytics

July 22, 2011
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Earlier this month Thomas Dinsmore, solutions architect for IBM Netezza’s Advanced Analytics team, had a great blog post on why companies should embrace R as an analytics platform. He says: There are three main reasons R should be part of your enterprise analytics architecture: R has capabilities not available in commercial analytics software Usage of R by analysts is...

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A bit of fun with R

July 22, 2011
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A bit of fun with R

R isn't just about serious things like model inference and prediction intervals and big analytics. Sometimes, R lets its hair down and just does weird and wonderful things because ... well just because. For example, with a package from Paulo Sonego, it can display your favourite XKCD cartoon: > install.packages("RXKCD", repos="http://R-Forge.R-project.org",type="source") > searchXKCD("support") num title 1 8 Red spiders...

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A Plot of 250 Random Walks

July 22, 2011
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A Plot of 250 Random Walks

For some reason I feel like plotting some random walks. Nothing groundbreaking, but hopefully this post will be useful to someone. Here's my R code:# Generate k random walks across time {0, 1, ... , T}T <- 100k <- 250initial.value <- 10GetRa...

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Le Monde puzzle [#28]

July 22, 2011
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Le Monde puzzle [#28]

The puzzle of last weekend in Le Monde was about finding the absolute rank of x9 when given the relative ranks of x1,….,x8 and the possibility to ask for relative ranks of three numbers at a time. In R terms, this means being able to use or yet being able to sort the first 8

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Uwe Ligges joins R-core

July 22, 2011
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TU Dortmund professor Uwe Ligges is now a member of R-core, the group of 20 leading statisticians and computer scientists who oversee the R Project and develop and maintain the source code for the R engine and its core packages. Uwe has been very active in the R project for many years: he maintains the system that builds Windows...

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