It’s already midnight. I’m sitting near my bed. And before going to bed, I’ll type my last post on London 2012 Olympics. Olympic games are not only individual competitions, but also the reflections of countries’ strength. This is one reason why Olympics data … Continue reading →
When producing regression or classification trees (standard rpart or ctree from party package) in GNU R I am often unsatisfied with the default plots they produce. One of many possible solutions is to export a tree plot to Asymptote.The ...
I love Nathan Yau’s tutorial on making choropleths from a SVG file. However, if you don’t have a SVG handy already and instead you want to repurpose a map from another vector format such as PDF or EPS, there are … Continue reading →
A commentator on my blog brought up this nice idea of how to use the GScholarScraper function for bibliometrics..I altered the code a little bit which enables to set a year since when results should be returned and added a field to the output collectin...
Welcome to the blog of MPK Analytics – the consulting and training company whose mission it is to help clients in academia, industry and government to transform their data into insight using 
A National Institute for Occupational Safety and Health study, published in March, found that professional American football (NFL) players lived longer, on average, than similar "mere mortals" in the general population. Football is a dangerous sport, so that might seem surprising at first, until you consider the fact that NFL players are elite sportsmen: only the strongest, fastest and...
Finding the best subset of variables for a regression is a very common task in statistics and machine learning. There are statistical methods based on asymptotic normal theory that can help you decide whether to add or remove a variable at a time. The ...
From one of the R lists I follow: Today (2012-08-23) on CRAN : “Currently, the CRAN package repository features 4001 available packages.” These packages are maintained by approximately 2350 different folks. Previous milestones: 2011-05-12: 3,000 packages 2009-10-04: 2,000 packages 2007-04-12: 1,000 packages 2004-10-01: 500 packages 2003-04-01: 250 packages http://cran.r-project.org/web/packages/
I've been in China working for a few weeks (where this blog is (oddly) blocked). So, I haven't been able to post much over the summer. To kick things off for the new (academic) year, I thought I might just re-post something good I saw on the Book of Sa...
The other day a question about faceting data came up in the Dallas R Users group (link of conversation). The hist() function is more efficient and uses less memory than the cut() function. Additionally, hist() returns an object that makes...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
