Monthly Archives: September 2012

RcppArmadillo 0.3.4.2

September 25, 2012
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The development of Armadillo 3.4.* continues with bug fixes and more sparse matrix support. Conrad release 3.4.2 this morning. I wrapped up the corresponding RcppArmadillo 0.3.4.2 before leaving for work, and this version should now have all CRAN mirr...

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R Helper Functions

September 25, 2012
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R Helper Functions

If you do a lot of R programming, you probably have a list of R helper functions set aside in a script that you include on R startup or at the top of your code. In some cases helper functions add capabilities that aren’t otherwise available. In other cases, they replicate functionality that is available The post R...

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Playing with The Circular Law in Julia

September 25, 2012
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Playing with The Circular Law in Julia

Introduction Statistically-trained readers of this blog will be very familiar with the Central Limit Theorem, which describes the asymptotic sampling distribution of the mean of a random vector composed of IID variables. Some of the most interesting recent work in mathematics has been focused on the development of increasingly powerful proofs of a similar law,

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Guest post: Visualizing data using a 3D printer

September 25, 2012
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Guest post: Visualizing data using a 3D printer

In a break from my usual obsessions and interests here is a guest blog post by Ian Walker. I'm posting it because I think it is rather cool and hope it will be of interest to some of my regular readers. Ian is perhaps best known (in the blogosphere) f...

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Spatial segregation in cities – An explanation by a neural network model (Demographics & neural network)

September 25, 2012
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Spatial segregation in cities – An explanation by a neural network model (Demographics & neural network)

Two particular courses and other upcoming events

September 25, 2012
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Two particular courses and other upcoming events

Featured I’ll be leading two courses in the near future: Value-at-Risk versus Expected Shortfall 2012 October 30-31, London. 30th: “Addressing the critical challenges and issues raised by the Basel proposal to replace VaR with Expected Shortfall” 31st: “Variability in Value-at-Risk and Expected Shortfall” led by Patrick Burns Details at CFP Events. Finance with R Workshop … Continue reading...

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Thanks to our guest bloggers

September 25, 2012
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Thanks to our guest bloggers

I'm back from a very relaxing holiday in Australia. Many thanks to our guest bloggers for filling in over the last couple of weeks with some great information about R while I was away. If you missed any of the posts, be sure to check them out: Douglas McNair, "Population health management with RevoScaleR" Yihui Xie, "Integrate data and...

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Specifying Variables in R

September 25, 2012
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Specifying Variables in R

R has several ways to specify which variables to use in an analysis. Some of the most frustrating errors can result from not understanding the order in which R searches for variables. This post demonstrates that order, hopefully smoothing your … Continue reading →

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Learning Kernels SVM

September 25, 2012
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Learning Kernels SVM

Machine Learning and Kernels A common application of machine learning (ML) is the learning and classification of a set of raw data features by a ML algorithm or technique. In this context a ML kernel acts to the ML algorithm … Continue reading →

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Visually-weighted regression plots, with Zelig

September 25, 2012
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Visually-weighted regression plots, with Zelig

As a follow-up to yesterday’s post on producing visually-weighted regression plots, here is some code which illustrates the production of similar plots, but using Zelig’s convenient modeling and simulation functions. This code was produced...

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