Monthly Archives: February 2012

First Milano R net meeting to be held in May 2012

February 28, 2012
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We are organising the first Milano R net meeting in May 2012. Please visit this page in a few days for news.

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Adventures in R Studio Server: Apache2, Https, Security, and Amazon EC2.

February 28, 2012
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I just put a fresh install of Ubuntu Server (10.04.4 LTS) on one of our machines.  As I was doing some post-install config, I accidentally installed Rstudio Server.  And subsequently fell down an exciting little rabbit-hole of server configur...

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Exponential smoothing and regressors

February 28, 2012
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I have thought quite a lot about including regressors (i.e. covariates) in exponential smoothing (ETS) models, and I have done it a couple of times in my published work. See my 2008 exponential smoothing book (chapter 9) and my 2008 Tourism Management paper. However, there are some theoretical issues with these approaches, which have come to light through the research of...

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All Your Source Code Are Belong to… Nature?

February 28, 2012
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The Journal of Nature put out an interesting op-ed recently discussing the need to make source code available for scientific articles that require statistical computation to produce their results. http://www.nature.com/nature/journal/v482/n7386/ful...

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Project Euler in R: Problem 26

February 27, 2012
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I have been posting R solutions to Project Euler problems as a way of polishing my R skills. Here is the next problem in the series, problem 26. The problem is stated as follows:A unit fraction contains 1 in the numerator. The decimal representati...

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how to read csv files into r

February 27, 2012
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(This article was first published on twotorials by anthony damico, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: twotorials by anthony damico. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL,...

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how to use a function and read the help files in r

February 27, 2012
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(This article was first published on twotorials by anthony damico, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: twotorials by anthony damico. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL,...

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PCA for NIR Spectra_part 005: "Reconstruction"

February 27, 2012
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PCA for NIR Spectra_part 005: "Reconstruction"

We saw how to plot the raw spectra (X), how to calculate the mean spectrum, how to center the sprectra (subtracting the mean spectrum from every spectra of the original matrix X). After that we have developed the PCAs with the NIPALS algorithm, getting...

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R integrated throughout the enterprise analytics stack

February 27, 2012
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The past couple of years have seen a dramatic growth in the use of the R language in the enterprise. R has always been pervasive in academia for research and teaching in statistics and data science, and as new graduates trained in R have migrated to the workplace the demand for R in corporations has become more and more...

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RHadoop updated: improved performance and more control

February 27, 2012
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Revolution Analytics' open-source RHadoop project, which provides integration between R and Hadoop, has been updated with the release of version 1.2 of the "rmr" package. New in this version: support for binary I/O formats, which improves on the text-only interfact by allowing use of faster and more space-efficient data formats like R's native serialization format. This version also improves...

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