R Interface for Teaching Kaitlin Thaney asked on Twitter last week about using Ramnath Vaidyanathan's new interactive R notebook 1 2 for teaching. Liking the look of interactive R notebook by @ramnath_vaidya. Any success stories in using to teach? http://t.co/wmVuFM2Rst (HT @_inundata)— Kaitlin Thaney (@kaythaney) July 9, 2013 Now, to be clear up front,...
R and Big Data at Big Data Summit at UI Research Park
I spent yesterday at the very enjoyable Big Data Summit held at the University of Illinois Research Park at the edge of the University of Illinois at Urbana-Champaign. campus. My (short) presentation was...
An Animation of the t Distribution as a Mixture of Normals
You’ve probably heard about the t distribution. One good use for this distribution is as an alternative to the normal distribution that is more robust against outliers. But where...
Fall is the data analysis season
Dear diary, I spent a lot of my summer in the lab, and my fall has been mostly data analysis, with a little writing and a couple of courses...
Using Samatha
Using Samatha So I decided to try out David Springates Samatha package for statically building this blog. If you decide to use it, be warned, right now it is a...
Weekend Reading: F-Squared
Mebane Faber posted another interesting blog post: Building a Simple Sector Rotation on Momentum and Trend that caught my interest. Today I want to show how you can test...
CSI Stats: looking for traces of data fraud in R
Recently, I was looking at some published research, and I became concerned that it looked strange. Firstly, it had results wildly different to other similar studies, and more exciting...
Le Monde puzzle [#843]
A Le Monde mathematical puzzle of moderate difficulty: How many binary quintuplets (a,b,c,d,e) can be found such that any pair of quintuplets differs by at least two digits? I...
24 Days of R: Day 6
I've finally had some success at munging some HTML. For quite some time, I've wanted to render a county level choropleth for US presidential election results. The numbers are...
Writing Type-Stable Code in Julia
For many of the people I talk to, Julia’s main appeal is speed. But achieving peak performance in Julia requires that programmers absorb a few subtle concepts that are...
On the growth of R and Python for data science
A recent article by Matt Asay claims that "Python is displacing R as the language for data science". Python has certainly made some great strides in recent years, evolving...
Three Quick and Simple Data Cleaning Helper Functions (December 2013)
As I go about cleaning and merging data sets with R I often end up creating and using simple functions over and over. When this happens, I stick them...
R / Bioconductor for High-Throughput Sequence Analysis
I would like to recommend a recent workshop material on R/Bioconductor from Marc Carlson et al.http://www.bioconductor.org/help/course-materials/2013/SeattleMay2013/PDF: IntermediateSequenceAnalysis2013.pdfR script: IntermediateSequenceAnalysis201...
New package: jsonlite. A smart(er) JSON encoder/decoder.
This week we released a new package on CRAN: jsonlite. This package is a fork of RJSONIO by Duncan Temple Lang...
Incidental Parameters Problem with Binary Response Data and Unobserved Individual Effects
It is a well known problem that in some models as the number of observations becomes large, econometric estimators fail to converge on consistent estimators. The leading case of...
24 Days of R: Day 5
Some time back, I started a project on GitHub wherein I would explore the efficacy of financial literacy efforts in the area where I live. This is done with...
Conditional densities, on one single graph
With Stéphane Tufféry we’ve been working on credit scoring1 and we’ve been using the popular german credit dataset, > myVariableNames <- c("checking_status","duration","credit_history", + "purpose","credit_amount","savings","employment","installment_rate", + "personal_status","other_parties","residence_since","property_magnitude", + "age","other_payment_plans","housing","existing_credits","job", +...
Check if a Variable Exists in R
If you use attach, it is easy to tell if a variable exists. You can simply use exists to check:>attach(df)>exists("varName") TRUEHowever, if you don't use attach (and I find you generally...
A conversation with Robert Scoble
I had the pleasure of visiting technology guru Robert Scoble at Rackspace Labs a few weeks ago. We had a great conversation about the Big Data revolution, and how...
New version of image.scale function
Below is an updated version of the image.scale function. In the old version, one had to constantly use additional arguments to suppress axes and their labels. The new version...
My first… plot (.ly): beautiful plots with Plotly
Dear R-enthusiastic, I discovered Plotly some days ago, and I was fascinated by it. What is Plotly? Plotly is a service for creating and sharing data visualizations that also...
My current R projects at the end of 2013
I have been meaning to write a long post explaining each of the major R projects I am currently working on, but I can't seem to find the time...
24 Days of R: Day 4
So my first attempt to sort out the career of Michael Caine via parsing of HTML data was a wash. I'm going to try this again, using Wikipedia. They've...
Unobserved Effects With Panel Data
It is common for researchers to be concerned about unobserved effects being correlated with observed explanatory variables.For instance, if we were curious about the effect of meditation on emotional...
Averaged Input Assumptions and Momentum
Today I want to share another interesting idea contributed by Pierre Chretien. Pierre suggested using Averaged Input Assumptions and Momentum to create reasonably quiet strategy. The averaging techniques are...
2013 was a good year for R User Group Meetings
by Joseph Rickert R user groups are thriving. By our count of events listed on Revolution Analytics' Community Calendar, there were about 441 face-to-face R meetups worldwide in 2013;...
a public list of R freelancers
tl,dr: If you want to be contacted for freelance R work, edit this list https://github.com/isomorphisms/hire-an-r-programmer/blob/master/README.md. Background/Problem: I was looking for a list of R-programming freelancers and realised...
Introduction to R for Quantitative Finance
An introductory book on Quantitative Finance and R I co-authored with some learned faculty members of the Corvinus University of Budapest (Michael Puhle, Edina Berlinger, Péter Csóka, Dániel...
Catching errors in R and trying something else
I recently encountered some functionality in R which most of you might already know. Nevertheless, I want to share it here, because it might come in handy for those...
