What documentation exists for R?

Chapter 5: R Add-On Packages 57
sampfling Implements a modified version of the Sampford sampling algorithm. Given
a quantity assigned to each unit in the population, samples are drawn with
probability proportional to te product of the quantities of the units included in
the sample.
samr Significance Analysis of Microarrays.
sandwich Model-robust standard error estimators for time series and longitudinal data.
sca Simple Component Analysis.
scaleboot Approximately unbiased p-values via multiscale bootstrap.
scape functions to import and plot results from statistical catch-at-age models, used
in fisheries stock assessments.
scapeMCMC
Markov-chain Monte Carlo diagnostic plots, accompanying the scape package.
scatterplot3d
Plots a three dimensional (3D) point cloud perspectively.
sciplot Scientific graphing functions for factorial designs.
scope Data manipulation using arbitrary row and column criteria.
scuba Scuba diving calculations and decompression models.
seacarb Calculates parameters of the seawater carbonate system.
seas Detailed seasonal plots of temperature and precipitation data.
seewave Time wave analysis and graphical representation.
segmented Functions to estimate break-points of segmented relationships in regression
models (GLMs).
sem Functions for fitting general linear Structural Equation Models (with observed
and unobserved variables) by the method of maximum likelihood using the
RAM approach.
sensitivity Sensitivity analysis.
seqinr Exploratory data analysis and data visualization for biological sequence (DNA
and protein) data.
seqmon Sequential monitoring of clinical trials.
session Functions for interacting with, saving and restoring R sessions.
setRNG Set (normal) random number generator and seed.
sfsmisc Utilities from Seminar fuer Statistik ETH Zurich.
sgeostat An object-oriented framework for geostatistical modeling.
shapefiles Functions to read and write ESRI shapefiles.
shapes Routines for the statistical analysis of shapes, including procrustes analysis,
displaying shapes and principal components, testing for mean shape difference,
thin-plate spline transformation grids and edge superimposition methods.