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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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  The null hypothesis is that the ratio of the variances of the
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  The null hypothesis is that the ratio of the variances of the
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  populations from which \code{x} and \code{y} were drawn, or in the
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  populations from which \code{x} and \code{y} were drawn, or in the
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  data to which the linear models \code{x} and \code{y} were fitted, is
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  data to which the linear models \code{x} and \code{y} were fitted, is