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I saw an interesting “challenge” on StackOverflow last night to create an XKCD style chart in R. A couple of hours later & going in a very similar direction to a couple of the answers on SO, I got to something that looked pretty good, using the sin and cos curves ... [Read more...]

For a long time, I was wondering how to get R to automatically load packages I use every time I open the program. For example, for a variety of reasons, I use the ‘Cairo’ package to save all my figures as … Continue reading → [Read more...]

The next minor update to R — version 2.15.2 "Trick or Treat" — will be released on October 26, R-core member Peter Dalgaard announced today. You can find the planned updates in the current NEWS file (scroll down to the section 'CHANGES IN R VERSION 2.15.1 patched'; the changes at the top of the file ... [Read more...]

In the course of putting together data for my kriging project with the CRN stations, I got another idea related to a small but potentially important corner of the concerns over UHI in the global temperature index. For clarity I suppose I should make it clear that my position is ... [Read more...]

Here is my presentation from last night’s Boston Predictive Analytics Meetup graciously hosted by Predictive Analytics World Boston. The talk is meant to provide an overview of (some) of the different ways to get data into R, especially supplementary data sets to assist with your analysis. All code and ... [Read more...]

Joel Caldwell gave an example of Confirmatory factor analysis in lavaan. The purpose of this post is to show you how to express this model in OpenMx. The data being modeled are in an object called ratings (see below for the code to create this object as described here. Here’... [Read more...]

My workshop R for SAS, SPSS and Stata Users has been popular over the years, but it’s time for an overhaul. A common request has been to simplify it, so I have moved data management to a separate 4-hour workshop, … Continue reading → [Read more...]

ggplot2 has just hit 0.9.2, and with the change comes a new theme system. Previous versions of ggplot2 offered a theme_blank(), which was a stripped-down, essentially blank plotting canvas, but it is now deprecated. github user jrnold has produced a s... [Read more...]

This two days course shows wide variety of “Advanced R” topics ranging from S4 methods and classes to parallel computing in order to provide an exhaustive overview of R capabilities. Continue reading → [Read more...]

If connecting data to the real world is the next sexy job, then how do I do this? And how do I connect the real world to R? It can be done as Matt Shottwell showed with his home made ECG and a patched version of R at useR! 2011. However, ... [Read more...]

I have written a few posts discussing descriptive analyses of evaluation of National Standards for New Zealand primary schools.The data for roughly half of the schools was made available by the media, but the full version of the dataset is … Continue reading → [Read more...]

the arf is fun to say out loud.  it's also a single county-level data table with about 6,000 variables, produced by the united states health services and resources administration (hrsa).  the file contains health information and statistics fo... [Read more...]

I've had a quick look at this article on R-bloggers $-$ I don't think I've followed the whole exchange, but I believe they have discussed what models should/could be applied to estimate football scores (specifically, in this case they are using the Dut... [Read more...]

The Maker Movement has led to the production of open-source 3-D printers and other manufacturing machines that allow hobbyists to design, create and produce real-world objects affordably. Now R user Ian Walker, in a post at the Psychological Statistics blog, shows how to use the R language to transform 3-D ... [Read more...]

A number of marketing researchers use the orthoplan procedure in SPSS to generate fractional factorial designs.  It is not surprising, then, that I received a number of questions concerning the recent article in the Journal of Statistical Software by Hideo Aizaki on “Basic Functions for Supporting an Implementation of Choice ... [Read more...]

A colleague is a devotee of confidence intervals. To him, the CI have the magical property that they are immune to the multiple comparison problem-- in other words, he feels its OK to look at a bunch of 95% CI and focus on the ones that appear to exclude the null. ... [Read more...]

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Model level fit summaries can be tricky in R. A quick read of model fit summary data for factor levels can be misleading. We describe the issue and demonstrate techniques for dealing with them.When modeling you often encounter what are commonly called categorical variables, which are called factors in ... [Read more...]

I am currently doing an internship in England. Therefore, I keep alternating between French and English in my different emails and other forms of communication on the Internet. I have been surprised to see that some websites are able to recognize when I use French or when I use English. ... [Read more...]