We have a growing interest in using our favorite tools (R and Mathematica) to build web interfaces to interactively explore and visualize data. Our last 5 posts have involved interactive tools, namely Mathematica’s computable document format and R’s new Shiny package.

The people behind the wonderful RStudio, which I gushed about in a previous post, have developed a new package, Shiny, that makes it easy to develop interactive web applications with R.

I write sloppy R scripts. It is a byproduct of working with a high-level language that allows you to quickly write code on the fly (see this post for a nice description of the problem in Python code) and the result of my limited formal training in computer programming.

I am a sucker for beautiful applications. The latest R-related application to catch my eye is RStudio. RStudio™ is a free and open source integrated development environment (IDE) for R.

Ecologists commonly collect data representing counts of organisms. Generalized linear models (GLMs) provide a powerful tool for analyzing count data.1 The starting point for count data is a GLM with Poisson-distributed errors, but not all count data meet the assumptions of the Poisson distribution.

This post is a quick tip on how to use the paste1 function to read and write multiple files. First, let’s create some data. dataset = data.frame(expand.grid(Trt=c(rep("Low",10),rep("High",10)), Sex=c(rep("Male",10),rep("Female",10))), Response=rnorm(400)) The next step is not necessary, but makes the subsequent code more readable.

As a general rule, you should not transform your data to try to fit a linear model. But proportions can be tricky. If the proportion data do not arise from a binomial process (e.

In a previous post, I showed how to keep text and symbols at the same size across figures that have different numbers of panels. The figures in that post were ugly because they used the default panel spacing associated with the mfrow argument of the par function.

In R, there are a couple of packages that allow you to create multi-panel figures (ggplot2 and lattice), but, of course, you can also make multi-panel figures in the base package.