Monthly Archives: September 2010

Classification Trees

September 18, 2010
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Classification Trees

Decision trees are applied to situation where data is divided into groups rather than investigating a numerical response and its relationship to a set of descriptor variables. There are various implementations of classification trees in R and the some commonly used functions are rpart and tree. Fast Tube by Casper To illustrate the use of the tree

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What should we call the stats Q&A site?

September 18, 2010
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What should we call the stats Q&A site?

The Q&A site at stats.stackexchange.com has been steaming ahead with loads of good questions and answers. We are currently trying to select a name and not many people have voted. Although we have more than 1300 users of the site, less than 40 people have currently voted on the name. There are four days left.

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A simple Metropolis-Hastings MCMC in R

September 17, 2010
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A simple Metropolis-Hastings MCMC in R

While there are certainly good software packages out there to do the job for you, notably BUGS or JAGS, it is instructive to program a simple MCMC yourself. In this post, I give an educational example of the Bayesian equivalent of a linear regression, sampled by an MCMC with Metropolis-Hastings steps, based on an earlier…

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Running R on the iPad

September 17, 2010
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I'm a hardcore Mac user, so it's annoying to me that we don't yet support Revolution R Enterprise on MacOS X. Believe me, I've argued the point. But MacOS is still a relatively uncommon platform in business, and there's just not the demand yet from customers to justify porting the Revolution R extensions to MacOS X. (Open-source Revolution R...

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Installing ‘intergraph’ package

September 17, 2010
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Installing ‘intergraph’ package

After some e-mails I decided to put together a bit more detailed instruction how to install the ‘intergraph’ package together with the namespaced version of the ‘network’ package. See here. There seemed to be some problems with downloading the namespaced ‘network’ from my webstite (thanks Neil!). File permissions were set incorrectly. I fixed that and

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Physical economy v social economy

September 17, 2010
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Physical economy v social economy

There’s a hole in the bucket of traditional economics. Homo socialus seems to be on the rise, and homo economicus is getting harder to find. Vulcanism has become evident in the R community over the last several days.  One of the visible eruptions has been over money.  This resulted in a blog post by Tal … Continue reading...

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Typo in Example 3.6

September 16, 2010
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Typo in Example 3.6

Edward Kao pointed out the following difficulty about Example 3.6 in Chapter 3 of “Introducing Monte Carlo Methods with R”: I have two questions that have puzzled me for a while. I hope you can shed some lights. They are all about Example 3.6 of your book. 1. On page 74, there is a term

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Open source and money – why paying R developers might not always help the project

September 16, 2010
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This post can be summed up by one two sentences: “We can’t buy love.” “Starting to pay for love could make it disappear” while at the same time “We need money to live and love”. These two conflicting forces, with relation to open source, are the topic of this post. This post is directed to the community or R...

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Complex-valued linear models

September 16, 2010
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Complex-valued linear models

Someone has probably already written code to do this. But I couldn’t find it in CRAN, so here goes. Oh no lm() won’t take complex numbers! (or rather, it’ll take them, but it’ll discard the imaginary part.) Easy enough fix. … Continue reading →

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R’s time is now

September 16, 2010
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Jeff Kelly of Tech Target has just published a feature article about R. While R has been around for almost 20 years now (R&R first started the project in 1993), "its time may have finally come", he says. One thing I really like about the article is how well it highlights R's flexibility and "top-notch" data visualizations. It includes...

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