A Very Data Christmas

December 21, 2010
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A Very Data Christmas

This week Google announced its Ngram Viewer, which allows you to explore the use of words in thousands of texts overtime, going back two hundred years. Given the relatively long time period covered by this massive data set, it is fun to explore how language has changed overtime. Some texts, however, seem to transcend time.

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oro.nifti 0.2.4

December 21, 2010
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oro.nifti 0.2.4

The R package oro.nifti contains functions for the input/output and visualization of medical imaging data that follow either the ANALYZE, NIfTI or AFNI formats.  This package is part of the Rigorous Analytics bundle.Orthographic display of stru...

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oro.nifti 0.2.4

December 21, 2010
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oro.nifti 0.2.4

The R package oro.nifti contains functions for the input/output and visualization of medical imaging data that follow either the ANALYZE, NIfTI or AFNI formats.  This package is part of the Rigorous Analytics bundle.Orthographic display of stru...

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Back from Philly

December 20, 2010
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Back from Philly

The conference in honour of Larry Brown was quite exciting, with lots of old friends gathered in Philadelphia and lots of great talks either recollecting major works of Larry and coauthors or presenting fairly interesting new works. Unsurprisingly, a large chunk of the talks was about admissibility and minimaxity, with John Hartigan starting the day

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Michael Kane on Bigmemory

December 20, 2010
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Michael Kane on Bigmemory

Handling big data sets has always been a concern for R users. Once the size of the data set reaches above 50% of RAM, it is considered “massive” and can literally become impossible to work with on a standard machine. The bigmemory project, by Michael Kane and Jay Emerson, is one approach to dealing with

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Rcpp 0.9.0 and RcppClassic 0.9.0

December 20, 2010
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A new release 0.9.0 of Rcpp is now available at CRAN and has just been uploaded to Debian. As always, sources are also available from my local directory here. With this release, the older API which we have been referring to as the classic Rcpp A...

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MATLAB / R Reference

December 20, 2010
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nStrict Standards: Non-static method StringParser_Node::destroyNode() should not be called statically, assuming $this from incompatible context in /afs/ir.stanford.edu/users/k/n/knoepfle/cgi-bin/flatpress/fp-plugins/bbcode/inc/stringparser.class.php o...

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MATLAB / R Reference

December 20, 2010
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Anyone with a MATLAB background interested in transitioning to R is advised to check out this MATLAB / R Reference by Professor David Hiebeler of the University of Maine.

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Google Insights and RCurl

December 20, 2010
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nStrict Standards: Non-static method StringParser_Node::destroyNode() should not be called statically, assuming $this from incompatible context in /afs/ir.stanford.edu/users/k/n/knoepfle/cgi-bin/flatpress/fp-plugins/bbcode/inc/stringparser.class.php on line 358Google Insights is nifty. If you’re logged in to your Google account, you can download the results as a CSV file. This is straightforward if you’re using a browser; if you’re trying to retrieve the results...

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Google Insights and RCurl

December 20, 2010
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Google Insights is nifty. If you’re logged in to your Google account, you can download the results as a CSV file. This is straightforward if you’re using a browser; if you’re trying to retrieve the results of queries using R, however, things get more complicated. The following code retrieves the results of a Google Insights search for...

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How to buy a used car with R (part 2)

December 20, 2010
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How to buy a used car with R (part 2)

nStrict Standards: Non-static method StringParser_Node::destroyNode() should not be called statically, assuming $this from incompatible context in /afs/ir.stanford.edu/users/k/n/knoepfle/cgi-bin/flatpress/fp-plugins/bbcode/inc/stringparser.class.php on line 358Continued from Part 1.nnPart 2: Digging into the Kelley Blue BooknnThe only thing better than a bit of data is a lot of data. Now that we can grab KBB values for a given trim of...

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How to buy a used car with R (part 2)

December 20, 2010
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How to buy a used car with R (part 2)

Continued from Part 1. Part 2: Digging into the Kelley Blue Book The only thing better than a bit of data is a lot of data. Now that we can grab KBB values for a given trim of a given model in a given year, we set our ambitions higher: automating the collection of these values for...

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Vim plugin for R

December 19, 2010
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Vim plugin for R

Just found a very nice plugin for using R in Vim. It's unbelievable comfortable!

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Principal component analysis to yield curve change

December 19, 2010
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Principal component analysis to yield curve change

In quantitive finance,it is often said that yield curve change is explained by three factor,"parallel shift", "twist" and "butterfly".Because I found that we can get historical yield curve data from FRB's web site, I check whether these proverbial facts are correct or not.Yield curve data can be downloaded to click "Go to download" and "Download File" button. Default data...

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Principal component analysis to yield curve change

December 19, 2010
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Principal component analysis to yield curve change

In quantitive finance,it is often said that yield curve change is explained by three factor,"parallel shift", "twist" and "butterfly".Because I found that we can get historical yield curve data from FRB's web site, I check whether these proverbial facts are correct or not.Yield curve data can be downloaded to click "Go to download" and "Download File" button. Default data...

Read more »

White Bumblebee Implemented in R

December 18, 2010
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White Bumblebee Implemented in R

White Bumblebee is a trade system based on a simple moving average crossover, but with a special twist. Imagine your thermostat triggering your furnace to shut off or turn on every time a temperature crossed a threshold. If the thermostat didn't have a...

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AMIS revised & resubmitted

December 18, 2010
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AMIS revised & resubmitted

After a thorough revision that removed most of the theoretical attempts at improving our understanding of AMIS convergence, we have now resubmitted the AMIS paper to Scandinavian Journal of Statistics and arXived the new version as well. (I remind the reader that AMIS stands for adaptive mixture importance sampling and that it implements an adaptive

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R Workflow: Melbourne R Users Dec 1st 2010

December 18, 2010
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R Workflow: Melbourne R Users Dec 1st 2010

Melbourne R Users Group December 1st 2010 Meeting (Meetup page). 1. “What my R code looks and feels like (Vanilla)” by Geoff Robinson The other talk from the session was by Geoff Robinson who discussed several useful strategies for working … Continue reading →

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Visualizing Facebook Friends: Eye Candy in R

December 18, 2010
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Visualizing Facebook Friends: Eye Candy in R

Earlier this week I published a data visualization on the Facebook Engineering blog which, to my surprise, has received a lot of media covereage. I’ve received a lot comments about the image, many asking for more details on how I … Continue reading →

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ASReml-R: Storing A inverse as a sparse matrix

December 18, 2010
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I was testing ASReml-R program (an R package that links propriety ASReml binaries that can be used only with valid licence) this week and had to do some manipulations with the numerator relationship matrix (A). ASReml-R provides a function (asreml.Ainverse) that can create inverse of A directly from the pedigree as this inverse is needed in pedigree based...

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ASReml-R: Storing A inverse as a sparse matrix

December 18, 2010
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I was testing ASReml-R program (an R package that links propriety ASReml binaries that can be used only with valid licence) this week and had to do some manipulations with the numerator relationship matrix (A). ASReml-R provides a function (asreml.Ainverse) that can create inverse of A directly from the pedigree as this inverse is needed in pedigree based...

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In The Wild: rApache 1.1.13 in Ubuntu and Source

December 18, 2010
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In The Wild: rApache 1.1.13 in Ubuntu and Source

I rolled a new released eight days ago, but tumblr was down and I forgot to post. Then yesterday I remembered again, but then tumblr was down again. Doh! You can get rApache 1.1.13 from here in source form or learn about how to get it here in binary f...

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Introduction to ESS: talk and slides

December 17, 2010
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We had another meeting of the Chicago R User Group last evening. This was scheduled somewhat belatedly once we learned that Drew Conway would be in town. Drew gave a very nice talk about his brand new infochimps package (for accessing the eponymous i...

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Introduction to ESS: talk and slides

December 17, 2010
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We had another meeting of the Chicago R User Group last evening. This was scheduled somewhat belatedly once we learned that Drew Conway would be in town. Drew gave a very nice talk about his brand new infochimps package (for accessing the eponymous i...

Read more »

Joe West vs. Bruce Froemming: A Crude Umpire LHB/RHB Bias Comparison

December 17, 2010
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Joe West vs. Bruce Froemming: A Crude Umpire LHB/RHB Bias Comparison

In my last two posts, I have tinkered with the 'gam' package to create heat maps for individual umpire strike zones. I went ahead and grabbed Joe West's data (which has a lot more pitches than Bruce Froemming in it, since Froemming's data is only from...

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In case you missed it: November Roundup

December 17, 2010
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In case you missed them, here are some articles from November of particular interest to R users. Dirk Eddelbuettel and Romain Francois went to Google to talk about integrating R (using Rcpp, for example), and we gave a review of the video presentation. R co-creator Ross Ihaka wins a Lifetime Achievement Award in Open Source. Revolution has job openings...

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Programming languages, ranked by popularity

December 17, 2010
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Programming languages, ranked by popularity

In a presentation to the Chicago R User Group last night, Drew Conway used his new Infochimps package in R to assess the relative popularity of programming languages. Drew used the word.stats function in the Infochimps package to count the frequency of common computer languages mentioned in Twitter messages, and displayed the results in this bar chart: It's not...

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World Bank data plots – Take 2

December 17, 2010
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World Bank data plots – Take 2

A few months ago, I created World Bank plots and compiled the images on Flickr to share it online. Recently I came across Mark's post to create animated images in R and it inspired me to re-create my World Bank plots as animated images. ...

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World Bank data plots – Take 2

December 17, 2010
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World Bank data plots – Take 2

A few months ago, I created World Bank plots and compiled the images on Flickr to share it online. Recently I came across Mark's post to create animated images in R and it inspired me to re-create my World Bank plots as animated images. ...

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