Monthly Archives: February 2012

New R User Groups in Austin, Adelaide

February 3, 2012
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It's awesome to see so many local R user groups kicking off in 2011! Yet another is the Austin R User Group in Austin, Texas. They've already held their first informal get-together, and the first formal meeting on February 23 will be devoted to data management techniques in R. Props to Sandy Donlon for organizing the group! And I'm...

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Why don’t we hear more about Adrian Dantley on ESPN? This graph makes me think he was as good an offensive player as Michael Jordan.

February 3, 2012
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Why don’t we hear more about Adrian Dantley on ESPN? This graph makes me think he was as good an offensive player as Michael Jordan.

In my last post I complained about efficiency not being discussed enough by NBA announcers and commentators. I pointed out that some of the best scorers have relatively low FG% or TS%. However, via the comments it was pointed out that top scorers need ...

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Large search spaces using R

February 3, 2012
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I'm working on some really interesting stuff at the moment, the details of which I can't discuss for reasons of national security (not really). However, one of the things I've been doing a lot of is searching though lots of different combina...

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How many pages in Scott Walker Recall Petition PDF files?

February 3, 2012
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Computer Assisted Reporting In an online press release on Tuesday the Wisconsin Government Accountability Board announced they would put all 153,335 pages of PDF copies of the Scott Walker recall petition online later that day. The GAB announced the PD...

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Green Disk Sizing

February 3, 2012
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Green Disk Sizing

I finally got around to completing item 5 on my 2011 list concerning electrical power consumed by a magnetic hard disk drive (HDD). The semi-empirical statement is: Power ∝ Nplatters × Ω2.8 × D4.6    . . .    (1) where Nplatters is the number of platters on the spindle, Ω is the rotational speed in revolutions per minute (RPM) and D...

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Japan Quake Map 2010-2011

February 2, 2012
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Japan Quake Map 2010-2011

1 Introduction “The 3.11 Tohoku Earthquake in Japan”, It did serious damage to Japan. I have attempted gaining

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Commonly used R commands (statistics)

February 2, 2012
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When I say Ease of Use Improved, I mean you can simply copy, paste and run the codes in this post, without referring to other places, without downloading a data file and read it from R. This is how I like a blog article to be. You don’t need to read the whole article. You

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speed of R, C, &tc.

February 2, 2012
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speed of R, C, &tc.

My Paris colleague (and fellow-runner) Aurélien Garivier has produced an interesting comparison of 4 (or 6 if you consider scilab and octave as different from matlab) computer languages in terms of speed for producing the MLE in a hidden Markov model, using EM and the Baum-Welch algorithms. His conclusions are that matlab is a lot

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"R": Plotting the spectra (Gasoline) – 002

February 2, 2012
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"R": Plotting the spectra (Gasoline) – 002

"R" has a package called "ChemometricsWithR", where we can get data from different analytical instruments including Near Infrared (NIR).Follow the steps to plot the spectra of a gasoline data set:In this other case we plot the spectra of the NIR shootout 2002: > data(shootout)> wavelengths<-seq(600, 1898,by=2)> mattplot(wavelengths,shootout$calibrate.1,xlab="wavelength(nm)",ylab="log1/R)")>...

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R Chart featured in Facebook IPO

February 2, 2012
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R Chart featured in Facebook IPO

Page 7 of Facebook's 213-page S-1 filing for their record-breaking IPO includes the following chart, under the headline: "Our Mission: To make the world more open and connected". This chart was created using the R language and Hadoop by Facebook intern Paul Butler. (Thanks to the blog IOER Tools for first noticing the inclusion of the chart.) And speaking...

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