MATLAB / R Reference

December 20, 2010
By

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...

Read more »

MATLAB / R Reference

December 20, 2010
By

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.

Read more »

Google Insights and RCurl

December 20, 2010
By

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...

Read more »

Google Insights and RCurl

December 20, 2010
By

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...

Read more »

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

December 20, 2010
By
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...

Read more »

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

December 20, 2010
By
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...

Read more »

Vim plugin for R

December 19, 2010
By
Vim plugin for R

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

Read more »

Principal component analysis to yield curve change

December 19, 2010
By
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 »

Principal component analysis to yield curve change

December 19, 2010
By
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
By
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...

Read more »

AMIS revised & resubmitted

December 18, 2010
By
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

Read more »

R Workflow: Melbourne R Users Dec 1st 2010

December 18, 2010
By
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 →

Read more »

Visualizing Facebook Friends: Eye Candy in R

December 18, 2010
By
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 →

Read more »

ASReml-R: Storing A inverse as a sparse matrix

December 18, 2010
By

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...

Read more »

ASReml-R: Storing A inverse as a sparse matrix

December 18, 2010
By

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...

Read more »

In The Wild: rApache 1.1.13 in Ubuntu and Source

December 18, 2010
By
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...

Read more »

Introduction to ESS: talk and slides

December 17, 2010
By

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 »

Introduction to ESS: talk and slides

December 17, 2010
By

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
By
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...

Read more »

In case you missed it: November Roundup

December 17, 2010
By

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...

Read more »

Programming languages, ranked by popularity

December 17, 2010
By
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...

Read more »

World Bank data plots – Take 2

December 17, 2010
By
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. ...

Read more »

World Bank data plots – Take 2

December 17, 2010
By
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. ...

Read more »

Why use R

December 16, 2010
By
Why use R

Here's a link to a blog that lists some reasons to use Rhttp://blog.fosstrading.com/2010/12/why-use-r.html

Read more »

Disas-tea-R at dawn

December 16, 2010
By
Disas-tea-R at dawn

This was bound to happen sooner or later, given my addiction to tea and sleepless nights, so I eventually managed to spill a cup of tea over my Mac… I had been working for a few hours in my hotel room in Philadelphia, completing an ABC paper with Jean-Michel Marin and Robin Ryder. We had

Read more »

Issues of R Client Library For The Google Prediction API

December 16, 2010
By

The Google Prediction API is a black-box system for building predictive models, it provides pattern-matching and machine learning capabilities. So Google algorithms automatically creates a model from the training models given a set of training data and makes prediction under this model given a set of explanatory variables, read http://code.google.com/apis/predict/docs/getting-started.html for an overview. I am eager...

Read more »

R 2.12.1 is out

December 16, 2010
By

As promised, the latest patch to R is out with the release of R 2.12.1, as announced today by the R Core Team. If you build R yourself, sources are available now at your local CRAN mirror, and binaries for Windows, Mac and Linux will be available in the next few days. There are a few new features: The...

Read more »

Tennis and risk management

December 16, 2010
By
Tennis and risk management

As mentioned already here, while we were going to Québec City for the workshop, we had interesting discussions in the car, and Maciej mentioned an article recently published in The Actuary, Hence, I wanted to discuss (extremely) rare event probabi...

Read more »

Where to find good data sets

December 16, 2010
By

O'Reilly Media has been a big advocate of Open Data and believes that is where a lot of computing is going to be headed in the future.  I think they are definitely on to something.  Yet the future could be now.  There is a lot of opportu...

Read more »