What documentation exists for R?

Chapter 5: R Add-On Packages 54
psychometric
Applied psychometric theory: functions useful for correlation theory, metaanalysis
(validity-generalization), reliability, item analysis, inter-rater reliability,
and classical utility.
pwr Basic functions for power analysis.
pwt The Penn World Table providing purchasing power parity and national income
accounts converted to international prices for 168 countries for some or all of
the years 1950–2000.
pvclust Hierarchical clustering with p-value.
qcc Quality Control Charts. Shewhart quality control charts for continuous, attribute
and count data. Cusum and EWMA charts. Operating characteristic
curves. Process capability analysis. Pareto chart and cause-and-effect chart.
qp q-order partial correlation graph search algorithm.
qtl Analysis of experimental crosses to identify QTLs.
qtlDesign Tools for the design of QTL experiments.
qtlbim QTL Bayesian Interval Mapping.
quadprog For solving quadratic programming problems.
quantchem
Quantitative chemical analysis: calibration and evaluation of results.
quantreg Quantile regression and related methods.
quantregForest
Quantile Regression Forests, a tree-based ensemble method for estimation of
conditional quantiles.
qvalue Q-value estimation for false discovery rate control.
qvcalc Functions to compute quasi-variances and associated measures of approximation
error.
rJava Low-level R to Java interface. Allows creation of objects, calling methods and
accessing fields.
race Implementation of some racing methods for the empirical selection of the best.
rake Raking survey datasets by re-weighting.
randaes Random number generator based on AES cipher.
random True random numbers using random.org.
randomSurvivalForest
Ishwaran and Kogalur’s random survival forest.
randomForest
Breiman’s random forest classifier.
rankreg Rank regression estimator for the AFT model with right censored data.