Monthly Archives: April 2012

AdfTest Function Enhanced With Rcpp Armadillo

April 26, 2012
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In my previous post about rewriting my code to run in parallel part one I mentioned that we will make a small change to adfTest() function as well. In this post we will perform this small but performance-dramatic change. When you take a closer look at the source code of this particular function from fUnitRoots package

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Structural Breaks (Bull or Bear?)

April 26, 2012
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Structural Breaks (Bull or Bear?)

When I spotted the bfast R package, I could not resist attempting to apply it to identify bull and bear markets.  For all the details that I do not understand, please see the references: Jan Verbesselt, Rob Hyndman, Glenn Newnham, Darius Culvenor...

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Graphic Parameters (symbols, line types, and colors) for ggplot2

April 26, 2012
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Graphic Parameters (symbols, line types, and colors) for ggplot2

Following up on John Mount’s post on remembering symbol parameters in ggplot2, I decided to give it a try and included symbols, line types, and colors (based upon Earl Glynn’s wonderful color chart).  Code follows below.    

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Big Data statistics in the search for a cure for MS

April 26, 2012
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Multiple Sclerosis (MS) is a debilitating and complex disease with an unknown cause — and for which there is currently no cure. The SUNY Buffalo is home to one of the leading multiple sclerosis (MS) research centers in the world, and as reported in Healthcare IT News, the research team is using IBM Netezza and Revolution R Enterprise to...

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spam evolution

April 26, 2012
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spam evolution

Despite some rather modest protection (like a simple captcha), I still receive spammy comments on this blog every now and again. They’re easily spotted and actually never appear on the website. There’s obviously an incentive for the spammer to post … Continue reading →

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R Tips: lots of tips for R programming

April 26, 2012
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R Tips: lots of tips for R programming

by Yanchang Zhao, RDataMining.com There are more than 100 R tips at http://pj.freefaculty.org/R/Rtips.html, which provide quick examples to small challenges in everyday R programming, especially for users switching from other languages to R. There is also a .PDF version for … Continue reading →

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More PubMed data mining: looking at top 20 CBT journals

April 26, 2012
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More PubMed data mining: looking at top 20 CBT journals

In this short article I present some data of the top 20 Cognitive Behavior Therapy (CBT) journals with the most PubMed publications, and compare that to data from 2010 and 2011.

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More PubMed data mining: looking at top 20 CBT journals

April 26, 2012
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More PubMed data mining: looking at top 20 CBT journals

Introduction Continuing from what I wrote in my article An R Script to Automatically download PubMed Citation Counts By Year of Publication, I’ve now looked at article counts for journals. I did this by extending my script to download the complete article records in XML from inside R. Then...

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Installing R packages without admin rights on MS Windows

April 26, 2012
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Installing R packages without admin rights on MS Windows

Is there a life outside the office?Photo: Markus GesmannIt is not unusual that you will not have admin rights in an IT controlled office environment. But then again the limitations set by the IT department can spark of some creativity. And I have to ad...

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Graphing Predicted Legislative Violence with Zelig & ggplot2

April 25, 2012
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Graphing Predicted Legislative Violence with Zelig & ggplot2

In my previous post I briefly mentioned an early draft of a working paper (HERE) I've written that looks into the possible causes of violence between legislators (like the violence shown in this picture from the Turkish Parliament).  From The GuardianIn this...

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