June 2013

Time Is on My Side – A Small Example for Text Analytics on a Stream

June 23, 2013 | 0 Comments

Introduction and Background While my last posting was about recommendation in the context of Location Based Social Networks there are also other interesting topics regarding the analysis of unstructured data. The most established one is probably Text Analytics/Mining focusing on all sorts of text data.For me, coming from ... [Read more...]

Got Bootstrap?

June 23, 2013 | 0 Comments

This week I read the book by Michael Chernick and Robert LaBudde, An Introduction to Bootstrap Methods with Applications to R. It’s an interesting oeuvre for useRs of all stripes. I strongly recommend check it out. The book brings lots of examples of bootstrapping applications, such as standard errors, ... [Read more...]

GRNN and PNN

June 23, 2013 | 0 Comments

From the technical prospective, people usually would choose GRNN (general regression neural network) to do the function approximation for the continuous response variable and use PNN (probabilistic neural network) for pattern recognition / classification problems with categorical outcomes. However, from the practical standpoint, it is often not necessary to draw a ... [Read more...]

Generating Alerts From Guardian University Tables Data

June 23, 2013 | 0 Comments

One of the things I’ve been pondering with respect to the whole data journalism process is how journalists without a lot of statistical training can quickly get a feel for whether there may be interesting story leads in a dataset, or how they might be able to fashion “alerts” ... [Read more...]

FuzzyNumbers-0.3-1 released

June 23, 2013 | 0 Comments

A new version of the FuzzyNumbers package for R has just been submitted to the CRAN archive. Check out our step-by-step tutorial. ** FuzzyNumbers Package CHANGELOG ** ********************************************************************* 0.3-1 /2013-06-23/ * piecewiseLinearApproximation() - general case (any knot.n) for method="NearestEuclidean" now…Read more › [Read more...]

Prototyping A General Regression Neural Network with SAS

June 22, 2013 | 0 Comments

Last time when I read the paper “A General Regression Neural Network” by Donald Specht, it was exactly 10 years ago when I was in the graduate school. After reading again this week, I decided to code it out with SAS macros and make this excellent idea available for the SAS ... [Read more...]

Advanced Graphics I

June 22, 2013 | 0 Comments

Polygon is a such handy function in R for drawing beautiful charts where we can select regions (polygons) of the surface. It’s quite useful for indicating confidence regions of parameters, predictions for time-series, or areas under distributions: [Read more...]

Calling C++ from R using Rcpp

June 22, 2013 | 0 Comments

Why call C/C++ from R? I really like programming in R. The fact that it is open source immediately wins my favour over Matlab. It can, however, be quite slow especially if you “speak” R with a strong C/C++ accent. This sluggishness, especially when writing unavoidable for loops, ... [Read more...]

What is “Practical Data Science with R”?

June 22, 2013 | 0 Comments

A bit about our upcoming book “Practical Data Science with R”. Nina and I share our current draft of the front matter from the book, which is a description which will help you decide if this is the book for you (we hope that it is). Or this could be ... [Read more...]

Five years of Weight Tracking

June 22, 2013 | 0 Comments

After I moved back from New Jersey in June 2008 I started to track my body weight more seriously. My routine usually consists of getting up and after finishing the morning bathroom I would step on my scale. That way I try to ensure that the condition for each weighing are ...
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Announcing pqR: A faster version of R

June 22, 2013 | 0 Comments

pqR — a “pretty quick” version of R — is now available to be downloaded, built, and installed on Linux/Unix systems. This version of R is based on R-2.15.0, but with many performance improvements, as well as some bug fixes and new features. Notable improvements in pqR include: Multiple processor cores ... [Read more...]

Are Green Number Runners More Likely to Bail?

June 22, 2013 | 0 Comments

Comrades Marathon runners are awarded a permanent green race number once they have completed 10 journeys between Durban and Pietermaritzburg. For many runners, once they have completed the race a few times, achieving a green number becomes a possibility. And once the idea takes hold, it can become something of a ... [Read more...]

Not only CRAN downloads and Shiny … but also .. rCharts

June 21, 2013 | 0 Comments

I have been meaning for some time to get stuck into the rCharts package which provides an interface to many Javascript graphic libraries. These offer rich charting capabilities with interactivity and a great deal of customization. As regular readers will know, I am also interested in improved publicity for CRAN ... [Read more...]

R language skills: standard and necessary in today’s world

June 21, 2013 | 0 Comments

A recent Business Times article on Singapore's push to become a tech leader mentions Revolution Analytics new Center of Excellence, set up with the support of the Singapore government to train and grow a pool of data scientists and developers in data science. It includes this quote from SAP: "This ... [Read more...]

Job openings at conservative political analytics firm!

June 21, 2013 | 0 Comments

After posting that announcement about Civis Analytics, I wrote, “If a reconstituted Romney Analytics team is hiring, let me know and I’ll post that ad too.” Adam Schaeffer obliged: Not sure about Romney’s team, but Evolving Strategies is looking for sharp folks who lean right: Evolving Strategies is ...
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ggplot Tutorial

June 21, 2013 | 0 Comments

ggplot Tutorial I liked the following ggplot2 tutorial which is featured in Gabriela de Queiroz’s blog called unbiasedestimator. The tutorial looks very neatly presented and I’m sure that it will be very helpful to anyone just getting started with ggplot2 before they jump into ggplot2: Elegant Graphics for ... [Read more...]
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