Monthly Archives: March 2013

Hexadecimal literals in GNU R

March 11, 2013
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Recently I have used hexadecimal numbers in GNU R. The way they are parsed surprised me and is inconsistent with Java. As R Language Definition pdf only briefly mentions hexadecimal numbers here is what I have found.First I have checked the following c...

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FBit: GitHub repo for posts with R code for this blog

March 11, 2013
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FBit: GitHub repo for posts with R code for this blog

This is a test post since I want to improve upon Jeffrey Horner’s strategy for posting R code in Tumblr. The only minor improvement I wanted to try out is hosting the images directly on the web. I mean, right now the images won’t show in RSS readers. I’m not doing anything new at all, just using the...

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Discovering Argon with the 2-Sample t-Test

Discovering Argon with the 2-Sample t-Test

I learned about Lord Rayleigh’s discovery of argon in my 2nd-year analytical chemistry class while reading “Quantitative Chemical Analysis” by Daniel Harris.  (William Ramsay was also responsible for this discovery.)  This is one of my favourite stories in chemistry; it illustrates how diligence in measurement can lead to an elegant and surprising discovery.  I find

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Is CTA trend following Dead?

March 10, 2013
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Is CTA trend following Dead?

                                         This i...

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More sequential testing for triangle tests

March 10, 2013
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More sequential testing for triangle tests

I looked before at triangle tests and at sequential testing in triangle tests (blog entry). In the latter post it was demonstrated that a sequential test is possible, without costs in desired error of the first kind. The latter because t...

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Analyse Quandl data with R – even from the cloud

March 10, 2013
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Analyse Quandl data with R – even from the cloud

I have read two thrilling news about the really promising time-series data provider called Quandl recently: Quandl: A Wikipedia for Time Series DataQuandl package released to CRANWith the help of the Quandl R package* (development version...

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Better logging in R (aka futile.logger 1.3.0 released)

March 10, 2013
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Better logging in R (aka futile.logger 1.3.0 released)

In many languages logging is now part of the batteries included with a language. This isn’t yet the case in …Continue reading »

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Moving Average Representation of VAR

March 10, 2013
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Moving Average Representation of VAR

A vector autoregression (VAR) process can be represented in a couple of ways. The usual form is as follows:     The above (AR process) is what we often see and use in practice. However, I recently see more and … Continue reading →

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Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government

March 10, 2013
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Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government

Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government in conjunction with PAKDD 2013, Gold Coast, Australia, April 14, 2013 http://dmapps2013.rdatamining.com To attend the workshop, you need to register for PAKDD 2013 … Continue reading →

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Notes on my R / Git workflow

March 10, 2013
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These are some notes on my current R git work flow, which is quite fluid, and git has enough quirks that I usually forget part of it ! Creating Projects I've used both RStudio and Eclipse.  RStudio seems easier to create a 'project' and add a loca...

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