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% File src/library/stats/man/model.tables.Rd
% Part of the R package, http://www.R-project.org
% Copyright 1995-2007 R Core Development Team
% Distributed under GPL 2 or later

\name{model.tables}
\alias{model.tables}
\alias{model.tables.aov}
\alias{model.tables.aovlist}
%\alias{print.tables.aov}
\title{Compute Tables of Results from an Aov Model Fit}
\description{
  Computes summary tables for model fits, especially complex \code{aov}
  fits.
}
\usage{
model.tables(x, \dots)

\method{model.tables}{aov}(x, type = "effects", se = FALSE, cterms, \dots)

\method{model.tables}{aovlist}(x, type = "effects", se = FALSE, \dots)
}
\arguments{
  \item{x}{a model object, usually produced by \code{aov}}
  \item{type}{type of table: currently only \code{"effects"} and
    \code{"means"} are implemented.}
  \item{se}{should standard errors be computed?}
  \item{cterms}{A character vector giving the names of the terms for
    which tables should be computed. The default is all tables.}
  \item{\dots}{further arguments passed to or from other methods.}
}
\details{
  For \code{type = "effects"} give tables of the coefficients for each
  term, optionally with standard errors.

  For \code{type = "means"} give tables of the mean response for each
  combinations of levels of the factors in a term.

  The \code{"aov"} method cannot be applied to components of a
  \code{"aovlist"} fit.
}
\value{
  An object of class \code{"tables.aov"}, as list which may contain components
  \item{tables}{A list of tables for each requested term.}
  \item{n}{The replication information for each term.}
  \item{se}{Standard error information.}
}
\section{Warning}{
  The implementation is incomplete, and only the simpler cases have been
  tested thoroughly.

  Weighted \code{aov} fits are not supported.
}

\seealso{
  \code{\link{aov}}, \code{\link{proj}},
  \code{\link{replications}}, \code{\link{TukeyHSD}},
  \code{\link{se.contrast}}
}

\examples{
## From Venables and Ripley (2002) p.165.
N <- c(0,1,0,1,1,1,0,0,0,1,1,0,1,1,0,0,1,0,1,0,1,1,0,0)
P <- c(1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,1,1,0,0,1,0,1,1,0)
K <- c(1,0,0,1,0,1,1,0,0,1,0,1,0,1,1,0,0,0,1,1,1,0,1,0)
yield <- c(49.5,62.8,46.8,57.0,59.8,58.5,55.5,56.0,62.8,55.8,69.5,
55.0, 62.0,48.8,45.5,44.2,52.0,51.5,49.8,48.8,57.2,59.0,53.2,56.0)

npk <- data.frame(block=gl(6,4), N=factor(N), P=factor(P),
                  K=factor(K), yield=yield)
options(contrasts=c("contr.helmert", "contr.treatment"))
npk.aov <- aov(yield ~ block + N*P*K, npk)
model.tables(npk.aov, "means", se = TRUE)

## as a test, not particularly sensible statistically
npk.aovE <- aov(yield ~  N*P*K + Error(block), npk)
model.tables(npk.aovE, se=TRUE)
model.tables(npk.aovE, "means")
}
\keyword{models}