This R package implements leave pair out and nested cross validation in the caret package by Max Kuhn. It's a significant work in progress and lacks documentation and a thorough test suite but all that is coming.
This R package stands for command line machine learning. I created this package because I wanted to build a versatile package that used functional programming concepts in R. The package takes some cues from rails in promoting convention over configuration. The package was built with extensions in mind and allows programmers to easily add their own command line learning algorithms.
Projecttemplate is an excellent R package built by John Myles White. I am working on a fork that will have the option of running external scripts or functions in another directory on raw data. Sometimes R isn't the best for certain data munging procedures and this fork allows other scripting code to run. I hope to merge it back in the master when I complete this functionality.
This R package groups ICD-9-CM codes to higher level categories according to the clinical classification software developed as part of the Healthcare Cost and Utilization Project (HCUP).