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  \item{subset}{an optional vector specifying a subset of observations
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  \item{subset}{an optional vector specifying a subset of observations
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    to be used.}
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    to be used.}
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  \item{na.action}{a function which indicates what should happen when
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  \item{na.action}{a function which indicates what should happen when
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    the data contain \code{NA}s.  Defaults to
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    the data contain \code{NA}s.  Defaults to
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    \code{getOption("na.action")}.}
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    \code{getOption("na.action")}.}
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  \item{\dots}{further arguments to be passed to or from methods.}  
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  \item{\dots}{further arguments to be passed to or from methods.}
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}
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}
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\details{
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\details{
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  If \code{x} is a list, its elements are taken as the samples to be
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  If \code{x} is a list, its elements are taken as the samples to be
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  compared for homogeneity of variances, and hence have to be numeric
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  compared for homogeneity of variances, and hence have to be numeric
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  data vectors.  In this case, \code{g} is ignored, and one can simply
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  data vectors.  In this case, \code{g} is ignored, and one can simply
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  not yet contained in a list, use \code{fligner.test(list(x, ...))}.
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  not yet contained in a list, use \code{fligner.test(list(x, ...))}.
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  Otherwise, \code{x} must be a numeric data vector, and \code{g} must
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  Otherwise, \code{x} must be a numeric data vector, and \code{g} must
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  be a vector or factor object of the same length as \code{x} giving the
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  be a vector or factor object of the same length as \code{x} giving the
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  group for the corresponding elements of \code{x}.
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  group for the corresponding elements of \code{x}.
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  The Fligner-Killeen (median) test has been determined in a simulation
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  The Fligner-Killeen (median) test has been determined in a simulation
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  study as one of the many tests for homogeneity of variances which is
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  study as one of the many tests for homogeneity of variances which is
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  most robust against departures from normality, see Conover, Johnson &
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  most robust against departures from normality, see Conover, Johnson &
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  Johnson (1981).  It is a \eqn{k}-sample simple linear rank which uses
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  Johnson (1981).  It is a \eqn{k}-sample simple linear rank which uses
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  the ranks of the absolute values of the centered samples and weights
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  the ranks of the absolute values of the centered samples and weights