This document explains how you can manually install and configure Open Source R 2.15 on Microsoft Windows 7 Operating System to make R work with SAP Predictive Analysis 1.0.7 & above.
Suggestion is to try the PA provided automatic R install option first using this document (http://scn.sap.com/docs/DOC-33487) before you start the manual install.
This document provides a step by step description of the installation and configuration procedure.
It is an XML document and you can open it in Microsof Word.