What documentation exists for R?

Chapter 5: R Add-On Packages 59
spatialkernel
Nonparameteric estimation of spatial segregation in a multivariate point process.
spatstat Data analysis and modelling of two-dimensional point patterns, including multitype
points and spatial covariates.
spc Statistical Process Control: evaluation of control charts by means of the zerostate,
steady-state ARL (Average Run Length), setting up control charts for
given in-control ARL, and plotting of the related figures.
spdep A collection of functions to create spatial weights matrix objects from polygon
contiguities, from point patterns by distance and tesselations, for summarising
these objects, and for permitting their use in spatial data analysis; a collection
of tests for spatial autocorrelation, including global Moran’s I and Geary’s C,
local Moran’s I, saddlepoint approximations for global and local Moran’s I;
and functions for estimating spatial simultaneous autoregressive (SAR) models.
(Was formerly the three packages: spweights, sptests, and spsarlm.)
spe Stochastic Proximity Embedding.
spectralGP
Approximate Gaussian processes using the Fourier basis.
spectrino Spectra organizer, visualization and data extraction from within R.
spgrass6 Interface between the GRASS 6.0 geographical information system and R.
spgwr Geographically weighted regression.
splancs Spatial and space-time point pattern analysis functions.
ssanv Sample Size Adjusted for Nonadherence or Variability of input parameters.
sspir State SPace models In R.
st Shrinkage t statistic.
startupmsg
Utilities for start-up messages.
stashR A Set of Tools for Administering SHared Repositories.
statmod Miscellaneous biostatistical modelling functions.
stepPlr L2 penalized logistic regression with a stepwise variable selection.
stepwise A stepwise approach to identifying recombination breakpoints in a sequence
alignment.
stinepack Stineman interpolation package.
stochmod Learning and inference algorithms for a variety of probabilistic models.
strucchange
Various tests on structural change in linear regression models.
subselect A collection of functions which assess the quality of variable subsets as surrogates
for a full data set, and search for subsets which are optimal under various
criteria.