Monthly Archives: November 2012

The [95%] Confidence of Nate Silver

November 7, 2012
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The [95%] Confidence of Nate Silver

The headlines have been buzzing with the “triumph” of statistics and math in this election.  But before I jump into how well statistics served us, let’s do a little primer on the margin of error. Whenever we measure less than the whole population we’ll have some variability in the sample.  Chances are good that the

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Automated OSD Lookup and Display via SoilWeb and AQP

November 7, 2012
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Automated OSD Lookup and Display via SoilWeb and AQP

Automated OSD lookup and display   UPDATED 2013-04-08 This functionality it now available in the soilDB and sharpshootR packages. All code on this page is now superseded by the fetchOSD() and SoilTaxonomyDendrogram() functions.   UPDATED 201...

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Automated OSD Lookup and Display via SoilWeb and AQP

November 7, 2012
By
Automated OSD Lookup and Display via SoilWeb and AQP

Automated OSD lookup and display   UPDATED 2013-04-08 This functionality it now available in the soilDB and sharpshootR packages. All code on this page is now superseded by the fetchOSD() and SoilTaxonomyDendrogram() functions.   UPDATED 201...

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Revisiting the GOP Race with the Huff Post API and pollstR

November 7, 2012
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Revisiting the GOP Race with the Huff Post API and pollstR

Well, one election is over but it is never too soon to start another – or in this case revisit the past four years One day after the 2008 US Presidential election, there was a Rasmussen poll taken of 1000 likely voters asking for their choice for the 2012 Republican Presedential Candidate. The overwhelming favourite

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Granger Causality Testing in R

November 7, 2012
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Today just gets better and better!I had an email this morning from Christoph Pfeiffer, who follows this blog. Christoph has put together some nice R code that implements the Toda-Yamamoto method for testing for Granger causality in the context of non-stationary time-series data.Given the ongoing interest in the various posts I have had (

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RBelgium meeting on November, 16

RBelgium meeting on November, 16

Next week on Friday, November 16, the RBelgium R user group is holding its next Regular meeting in Brussels. This is the schedule of the upcoming RBelgium Regular meeting:* Graphical User Interface developments around R, including tcltk2 and SciViews - Philippe Grosjean (UMons)* Using R via the Amazon Cloud - Jean-Baptiste Poullet (stat'Rgy)* Literature review: R books - Brecht Devleesschauwer (UGent, UCL)The meeting will take place...

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In case you missed it: October 2012 Roundup

November 7, 2012
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In case you missed them, here are some articles from October of particular interest to R users. Sponsorships for local R user groups from Revolution Analytics are now open to applicants worldwide. During the landfall of Hurricane Sandy in the US, several R-based apps used public weather and social media data to document its impact, like this timeline of...

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My PLStroika and some thoughts on developing R packages

November 7, 2012
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My PLStroika and some thoughts on developing R packages

I’ve been using R on a daily basis for more than seven years, and I’ve been developing R packages over the last three years. I consider myself an experienced useR and most of my coworkers consider me an R master. However, there are still a lot of things that I don’t know about R. To be … Continue reading...

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Shootout 2012: Test & Val Sets proyections

November 7, 2012
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Shootout 2012: Test & Val Sets proyections

It is obvious (after seeing the spectra of the calibration set), that we have at least three clusters, and that this can be related with the concentration of the active ingredient in the tablets. If we see the scores in the PC1-PC2 score map we will se...

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Cash–Opportunity Lost or Opportunity Gained

November 7, 2012
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Cash–Opportunity Lost or Opportunity Gained

Tom Brakke from http://researchpuzzle.com/ wrote a great thought piece Cash as Trash, Cash as King, and Cash as a Weapon for the CFA Institute blog.  My favorite part comes in the last paragraph: “That’s the kind of analysis that should be br...

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