Another major statistical processing environment is R. It's an open source programming language and environment designed for statistical analysis. It's widely used and has an active community as well as a huge and growing body of useful add-on packages.
While there's no Clojure-specific interoperability library, there is one for Java, and we can use that to pass calls to R and to get results back. In this recipe, we'll set this system up.
We'll need to have R installed. We can download it from http://www.r-project.org/ by following the link to CRAN, picking a mirror, and downloading the correct version of R for our platform.
You'll also need to have Maven (http://maven.apache.org/) installed in order to build and install the libraries to access R.