What documentation exists for R?

Chapter 5: R Add-On Packages 55
rattle A graphical user interface for data mining in R using GTK.
rbugs Functions to prepare files needed for running BUGS in batch mode, and running
BUGS from R. Support for Linux systems with Wine is emphasized.
rcdd C Double Description for R, an interface to the CDD computational geometry
library.
rcdk Interface to the CDK libraries, a Java framework for cheminformatics.
rcom R COM Client Interface and internal COM Server.
rcompletion
TAB completion for R using Readline.
rda Shrunken Centroids Regularized Discriminant Analysis.
ref Functions for creating references, reading from and writing ro references and
a memory efficient refdata type that transparently encapsulates matrices and
data frames.
regress Fitting Gaussian linear models where the covariance structure is a linear combination
of known matrices by maximising the residual log likelihood. Can be
used for multivariate models and random effects models.
relaimpo RELAtive IMPOrtance of regressors in linear models.
relax Functions for report writing, presentation, and programming.
reldist Functions for the comparison of distributions, including nonparametric estimation
of the relative distribution PDF and CDF and numerical summaries as
described in “Relative Distribution Methods in the Social Sciences” by Mark
S. Handcock and Martina Morris, 1999, Springer.
relimp Functions to facilitate inference on the relative importance of predictors in a
linear or generalized linear model.
relsurv Various functions for regression in relative survival.
reshape Flexibly reshape data.
resper Sampling from restricted permutations.
reweight Adjustment of survey respondent weights.
rgdal Provides bindings to Frank Warmerdam’s Geospatial Data Abstraction Library
(GDAL).
rgenoud R version of GENetic Optimization Using Derivatives.
rggm Robustified methods for Gaussian Graphical Models.
rggobi Interface between R and GGobi.
rgl 3D visualization device system (OpenGL).
rhosp Side effect risks in hospital: simulation and estimation.
rimage Functions for image processing, including Sobel filter, rank filters, fft, histogram
equalization, and reading JPEG files.