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  The null hypothesis is that apart from an effect of \code{blocks},
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  The null hypothesis is that apart from an effect of \code{blocks},
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  the location parameter of \code{y} is the same in each of the
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  the location parameter of \code{y} is the same in each of the
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  \code{groups}.
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  \code{groups}.
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  If \code{y} is a matrix, \code{groups} and \code{blocks} are
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  If \code{y} is a matrix, \code{groups} and \code{blocks} are
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  obtained from the column and row indices, respectively.  \code{NA}'s
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  obtained from the column and row indices, respectively.  \code{NA}s
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  are not allowed in \code{groups} or \code{blocks};  if \code{y}
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  are not allowed in \code{groups} or \code{blocks};  if \code{y}
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  contains \code{NA}'s, corresponding blocks are removed.
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  contains \code{NA}s, corresponding blocks are removed.
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}
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}
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\value{
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\value{
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  A list with class \code{"htest"} containing the following components:
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  A list with class \code{"htest"} containing the following components:
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  \item{statistic}{the value of Friedman's chi-squared statistic.}
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  \item{statistic}{the value of Friedman's chi-squared statistic.}
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  \item{parameter}{the degrees of freedom of the approximate
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  \item{parameter}{the degrees of freedom of the approximate