Revision 0fec0daa887173262fd26a5cd86834fa278f4dae authored by Torsten Hothorn on 22 June 2006, 00:00:00 UTC, committed by Gabor Csardi on 22 June 2006, 00:00:00 UTC
1 parent 961f160
SymmetryTest.Rd
\name{SymmetryTest}
\alias{symmetry_test}
\alias{symmetry_test.formula}
\alias{symmetry_test.SymmetryProblem}
\alias{symmetry_test.table}
\title{ General Symmetry Test }
\description{
Testing the symmetry of a response for repeated measurements in a
complete block design.
}
\usage{
\method{symmetry_test}{formula}(formula, data, subset = NULL, \dots)
\method{symmetry_test}{SymmetryProblem}(object,
teststat = c("max", "quad", "scalar"),
distribution = c("asymptotic", "approximate", "exact"),
alternative = c("two.sided", "less", "greater"),
xtrafo = trafo, ytrafo = trafo, scores = NULL,
check = NULL, ...)
\method{symmetry_test}{table}(object, ...)
}
\arguments{
\item{formula}{a formula of the form
\code{y1 + ... + yp ~ x1 + ... + xq | block} where the variables
on the left and right hand side may be measured on arbitrary scales
and \code{block} is an optional factor for stratification.}
\item{data}{an optional data frame containing the variables in the
model formula.}
\item{subset}{an optional vector specifying a subset of observations
to be used.}
\item{object}{an object inheriting from class \code{SymmetryProblem} or an
object of class \code{table}.}
\item{teststat}{a character, the type of test statistic to be applied: either a
standardized scalar test statistic (\code{scalar}), or a
maximum type statistic (\code{max}) or a quadratic form
(\code{quad}).}
\item{alternative}{a character, the alternative hypothesis must be
one of \code{"two.sided"} (default), \code{"greater"} or
\code{"less"}. You can specify just the initial letter.}
\item{distribution}{a character, the null distribution of the test statistic
can be computed \code{exact}ly or can be approximated by its
asymptotic distribution (\code{asymptotic})
or via Monte-Carlo resampling (\code{approximate}).
Alternatively, the functions
\code{\link{exact}}, \code{\link{approximate}} or \code{\link{asymptotic}} can be
used to specify how the exact conditional distribution of the test statistic
should be calculated or approximated.}
\item{xtrafo}{a function of transformations (see \code{\link{trafo}})
to be applied to the variables on the right hand side of
\code{formula}, see below.}
\item{ytrafo}{a function of transformations (see \code{\link{trafo}})
to be applied to the variables on the left hand side of
\code{formula}, see below.}
\item{scores}{a named list of scores to be attached to ordered factors. In
case a variable is an unordered factor, it is coerced to
\code{ordered} first.}
\item{check}{a function to be applied to objects of class
\code{SymmetryTest} in order to check for specific forms, see below.}
\item{\dots}{further arguments to be passed to or from methods.}
}
\details{
This function handles symmetry problems where each block corresponds to
exactly one observation with repeated measurements.
}
\value{
An object inheriting from class \code{IndependenceTest} with
methods \code{show}, \code{pvalue} and \code{statistic}.
}
\keyword{htest}
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