Monthly Archives: February 2012

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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Serious Stats book and blog update

February 2, 2012
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This is a quick update to announce my new blog Serious Stats. This is a companion to my forthcoming book of the same name:Baguley, T. (2012, in press). Serious stats: A guide to advanced statistics for the behavioral sciences. Basingstoke: Palgrav...

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R graphic used for Facebook IPO

February 2, 2012
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R graphic used for Facebook IPO

Apparently former Facebook intern, Paul Butler,  graphic of the Facebook social network graph is being used for Facebook's IPO.  The social network graphic is featured on Page 7 of the IPO filing.  His graphic was featured on mashable an...

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On linear models with no constant and R2

February 2, 2012
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On linear models with no constant and R2

In econometrics course we always say to our students that "if you fit a linear model with no constant, then you might have trouble. For instance, you might have a negative R-squared". So I tried to find databases on the internet such that, when we ...

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R meets HANA

February 2, 2012
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R meets HANA

If you read my last blog called HANA meets R you will remember that we read data from HANA into R directly, without having to download an .csv file, but using ODBC. This time, we're going to read data from HANA as well, but after do some nice tricks on R, we're going to post back the...

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Great Maps with ggplot2

February 2, 2012
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Great Maps with ggplot2

The above map (and this one) was produced using R and g

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HANA meets R

February 2, 2012
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HANA meets R

In my previous HANA and R blogs, I have been forced to create .csv files from HANA and read them on R...an easy but also boring procedure...specially if your R report is supposed to be run on a regular basis...having to create an .csv file every time you need to run your report it's not a nice thing...After...

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tenured research position with ABC skills!

February 2, 2012
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tenured research position with ABC skills!

I just received this announcement for the opening of a (tenured/civil servant) position in the national research institute in biostatistics, genetics, and agronomy, INRA: Position opening with profile Approximate inference techniques in complex systems Key activities and required skills: You will develop methodological research in the field of statistical inference for models used in environmental

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