Getting to know the "apply"s in R is extremely handy for using the language efficiently and effectively. Unfortunately, the help files tend to be rather information-dense and are fairly overwhelming for newcomers. A recent blog post by Neil Saunders pr...
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apply functions in R
Getting to know the "apply"s in R is extremely handy for using the language efficiently and effectively. Unfortunately, the help files tend to be rather information-dense and are fairly overwhelming for newcomers. A recent blog post by Neil Saunders pr...
Graphing Highly Skewed Data
Graphing data with a few outliers is challenging, and some solutions are better than others. Here is a comparison of the alternatives.
Oh (de)bugger!
By number of questions asked, R passed MATLAB for the first time on Stack Overflow today. Thus it seems an appropriate time to write my first R-based post. This post concerns what to do when your R-code goes pear shaped. Back in June there were a couple of very good videos on R debugging that 
A brief introduction to “apply” in R
At any R Q&A site, you’ll frequently see an exchange like this one: Q: How can I use a loop to ? A: Don’t. Use one of the apply functions. So, what are these wondrous apply functions and how do they work? I think the best way to figure out anything in 
IEOR Tools Tutorial: Learning XML with R
I have been using a lot of R lately in my work. R (main site) is an open source statistical computing platform. Saying R is only used for statistics does not do it justice. I am finding it to be a really powerful statistical and optim...
IEOR Tools Tutorial: Learning XML with R
I have been using a lot of R lately in my work. R (main site) is an open source statistical computing platform. Saying R is only used for statistics does not do it justice. I am finding it to be a really powerful statistical and optim...
Rose plot using Deducers ggplot2 plot builder
The (excellent!) LearnR blog had a post today about making a rose plot in ggplot2. Following today’s announcement, by Ian Fellows, regarding the release of the new version of Deducer (0.4) offering a strong support for ggplot2 using a GUI plot builder, Ian also sent an e-mail where he shows how to create a rose plot using the new...
Consultants’ Chart in ggplot2
Excel Charts Blog posted a video tutorial of how to create a circumplex or rose or dougnut chart in Excel. Apparently this type of chart is very popular in the consulting industry, hence the “Consultants’ Chart”. It is very easy to make this chart in Excel 2010, but it involves countless number of clicks and 
Hard drive occupation prediction with R
On some environments, disk space usage can be pretty predictable. In this post, we will see how to do a linear regression to estimate when free space will reach zero, and how to assess the quality of such regression, all using R - the statistical soft...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
