This book describes EnvStats a new comprehensive R package for environmental statistics and
the successor to the S-PLUS module EnvironmentalStats for S-PLUS (first released in 1997).
EnvStats and R provide an open-source set of powerful functions for performing graphical and
statistical analyses of environmental data bringing major environmental statistical methods
found in the literature and regulatory guidance documents into one statistical package along
with an extensive hypertext help system that explains what these methods do how to use these
methods and where to find them in the environmental statistics literature. EnvStats also
includes numerous built-in data sets from regulatory guidance documents and the environmental
statistics literature. This book shows how to use EnvStats and R to easily: * graphically
display environmental data * plot probability distributions * estimate distribution parameters
and construct confidence intervals on the original scale for commonly used distributions such
as the lognormal and gamma as well as do this nonparametrically * estimate and construct
confidence intervals for distribution percentiles or do this nonparametrically (e.g. to
compare to an environmental protection standard) * perform and plot the results of
goodness-of-fit tests * compute optimal Box-Cox data transformations * compute prediction
limits and simultaneous prediction limits (e.g. to assess compliance at multiple sites for
multiple constituents) * perform nonparametric estimation and test for seasonal trend (even in
the presence of correlated observations) * perform power and sample size computations and
create companion plots for sampling designs based on confidence intervals hypothesis tests
prediction intervals and tolerance intervals * deal with non-detect (censored) data * perform
Monte Carlo simulation and probabilistic risk assessment * reproduce specific examples in EPA
guidance documents EnvStats combined with other R packages (e.g. for spatial analysis)
provides the environmental scientist statistician researcher and technician with tools to
get the job done!
