Last time I wrote about version control using Subversion (and its implementation in Eclipse). I still haven’t given up on it, but since I’m using a private repository, sharing code has been a bit tedious. I was introduced to git a while ago, but somehow decided to go ... [Read more...]

I was introduced to version control at the 2011 Belgrade R+OSGeo in higher education summer school. I’ve been using it in my daily work ever since. Recently the need to branch my project came up and this post describes how after a few hours of reading teh internets satisfied ... [Read more...]

I remember when I started with R, there was little processing power directed toward an IDE. I had enough problems with the syntax, loops and the like and R gui seemed adequate. When I started working on a heavy project, I had to knock it up a notch (bam!). After ... [Read more...]

StatET (an Eclipse plug-in that can handle, among other things, R) offers support for writing Sweave (.Rnw) documents. This is done via the external tool dialog, where one creates a new “device” that takes in a document and runs it over appropriate functions and programs. In this case, Sweave and ... [Read more...]

Writing to Excel files comes up rather often, especially if you’re collaborating with non-OSS users. There are several options, but I like the xlsx package way of doing things. Authors use Java to write to Excel files, which are basically compressed XML files. Alright, let’s get cracking. First, ... [Read more...]

Sometimes you will need  to add some points to an existing barplot. You might try but you will get a funky looking line/points. It’s a bit squeezed. This happens because bars are not drawn at intervals 1:10, but rather on something else. This “else” can be seen if you ... [Read more...]

Noise can be classified as pollution and lawmakers often (always?) treat it as such. Noise can have different origin points, point source being among the simplest to model. Because noise has broader health implications, being able to understand its propagation, a simple model can further our understanding in toning down ... [Read more...]

Should you need datasets that come with R and additional packages (you can access them via data()) in one single file, here’s what I did to dump the entire workspace into one file: This code can easily be adapted to dump individual dataset into its own file. [Read more...]

I have spent the better portion of the day trying to get a bootstrap working. I have adapter a pre-written bootstrap function, but I wanted to use a generic function, mostly for reaping fame and glory. My hypothesis was that writing a hand-written, unoptimized function will consume more computer time ... [Read more...]

A while ago I was asked whether calculating with datums and hours is possible in R. Especially, if you added an hours to 23:45 (say Jan 1, 2010) , would R know to jump to the next day – 00:45 (jan 2, 2010)? The answer is yes. Our only job is to tell R in […] [Read more...]

Why build and R package? It basically boils down to be able to brag at your local pub that a new version of YOUR package is on CRAN as of 7 p.m. CET. But seriously, if you’ve produced some function that other people might benefit (or have ordered them) ... [Read more...]

Statistical Analysis Q&A is a web page dedicated to exchange questions, answers and ideas primarily on statistics. [Read more...]