Monthly Archives: May 2011

Comparing HoltWinters() and ets()

May 29, 2011
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I received this email today: I have a question about the ets() function in R, which I am trying to use for Holt-Winters exponential smoothing. My problem is that I am getting very different estimates of the alpha, beta and gamma parameters using ets() compared to HoltWinters(), and I can’t figure out why. This is

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An Application of boot() to IV regression

May 28, 2011
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An Application of boot() to IV regression

Bootstrapping standard errors can be a useful technique when obtaining closed form for the standard error formula is difficult or intractable. In this post, I give an example of how to use R to create a bootstrap sampling distribution in the context o...

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RcppArmadillo 0.2.21

Following up Conrad's 1.99.2 release (in RcppArmadillo 0.2.20), we now have Armadillo 1.99.3 en route to the upcoming 2.0.0 release. Armadillo is a templated C++ library for linear algebra---which RcppArmadillo brings to R based on our Rcpp library...

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R for the web

May 27, 2011
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There is a nice R module for apache: rApache. So you can easily publish statistics.

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Collaborative R coding using Dropbox

May 27, 2011
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Collaborative R coding using Dropbox

I do like Dropbox. I’m a big fan of easy to use solutions to common problems. For me I work at two different sites and I do a significant amount of work at my desktop machine at home as well as on my laptop. Dropbox solved the problem of synchronising files between

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Handling Errors Gracefully

May 27, 2011
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In R functions sometimes produces warnings or errors. In the case of errors execution of a function or a series of commands can get halted when an error occurs, which can in some cases be frustrating especially if we want to continue our calculations. There are various functions available in R for dealing with errors

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Norvig and the Nature of Modern Science

May 27, 2011
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In this, Chomsky is in complete agreement with O’Reilly. (I recognize that the previous sentence would have an extremely low probability in a probabilistic model trained on a newspaper or TV corpus.)1 Anyone who considers themself an intellectual should be required to read this new essay by Peter Norvig. It’s the best summary I’ve ever

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Presentations from R/Finance 2011 available

May 27, 2011
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Last month's R/Finance 2011 conference in Chicago was an outstanding event, bringing together some of the best minds in applying R to financial data. Presentations from the speakers are now available for download, with a wealth of useful information there for anyone working in quantiative finance. Not to be missed, though, is John Bollinger's (yes, that John Bollinger) retrospective...

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Notes to Self: Getting Rapache working in Natty Narwhal (Ubuntu/Linux)

May 27, 2011
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Notes to Self: Getting Rapache working in Natty Narwhal (Ubuntu/Linux)

In this post, I cover my experiences in getting Rapache working in the latest version of Ubuntu (11, Natty Narwhal). …Continue reading »

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Beginne..R 1.0

May 26, 2011
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Opening this blog is a step in a long journey of discovery, learning and frustration. To begin with I would consider myself a beginner R user, I am getting better, but I am not about to write a package any time soon. I started using R about three years...

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