September 2010

Problems with R

September 20, 2010 | 0 Comments

Struggling for two whole days to do some not-terribly-advanced repeated-measures analysis of variance in R. Probably my worst experience with R so far and really an example of where R could do with some centralisation of effort. I have explo... [Read more...]

Cricket – opinions and facts

September 20, 2010 | 0 Comments

@zxaar's comments in a Cricinfo article prompted this post. He commented that - "He (Miandad) was not great outside of pakistan where he was helped by home umpires. Not a true great. Miadad's case states lie due to favour from umpires."I'm an Indian...
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Data Mining in A Nutshell

September 20, 2010 | 0 Comments

# The following code may look rough, but simply paste into R or# a text editor (especially Notepad++) and it will look# much better.# PROGRAM NAME: MACHINE_LEARNING_R# DATE: 4/19/2010# AUTHOR : MATT BOGARD# PURPOSE: BASIC EXAMPLES OF MACHINE LEAR...
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R Code Examples

September 19, 2010 | 0 Comments

Data Mining in a Nutshell 'neuralnet'  neural network estimation and visualizationVisualizing Agricultural Subsidies by KY County R Code For googleVis  Data Visualization
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R Tutorial Series: Labeling Data Points on a Plot

September 19, 2010 | 0 Comments

There are times that labeling a plot's data points can be very useful, such as when conveying information in certain visuals or looking for patterns in our data. Fortunately, labeling the individual data points on a plot is a relatively simple process ... [Read more...]

Why Use ProjectTemplate or Any Other Framework?

September 19, 2010 | 0 Comments

We use frameworks like Ruby on Rails or ProjectTemplate to minimize the time we spend on irrelevant details. By definition, an irrelevant detail isn’t of interest to us. But how can we tell which details are irrelevant? This isn’t a trivial task and it seems to be, on ... [Read more...]

Elder Research Two Day Course

September 18, 2010 | 0 Comments

... or what I did on my summer vacation...Just got back from the Elder Research Two Day Course "Tools for Discovering Patterns in Data".  It was a great course that (while not R specific) provides a great overview of Data Mining tools and tec... [Read more...]

Using R

September 18, 2010 | 0 Comments

By Matt BogardAbstractR is a statistical programming language with a command line interface that is becoming more and more popular every day. I have used R for data visualization, data mining/machine learning, as well as social network analysis. Initia...
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Classification Trees

September 18, 2010 | 0 Comments

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 ...
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What should we call the stats Q&A site?

September 18, 2010 | 0 Comments

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 ...
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A simple Metropolis-Hastings MCMC in R

September 17, 2010 | 0 Comments

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 ... [Read more...]

Running R on the iPad

September 17, 2010 | 0 Comments

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 ... [Read more...]

Installing ‘intergraph’ package

September 17, 2010 | 0 Comments

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 ...
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Physical economy v social economy

September 17, 2010 | 0 Comments

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 ...
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Typo in Example 3.6

September 16, 2010 | 0 Comments

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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Complex-valued linear models

September 16, 2010 | 0 Comments

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 | 0 Comments

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 ... [Read more...]
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