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% File src/library/stats/man/xtabs.Rd
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% File src/library/stats/man/xtabs.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2009 R Core Team
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% Copyright 1995-2013 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\newcommand{\CRANpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
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\newcommand{\CRANpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
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\name{xtabs}
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\name{xtabs}
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  only handles 2-d tables).
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  only handles 2-d tables).
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  If a left hand side is given in \code{formula}, its entries are simply
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  If a left hand side is given in \code{formula}, its entries are simply
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  summed over the cells corresponding to the right hand side; this also
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  summed over the cells corresponding to the right hand side; this also
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  works if the lhs does not give counts.
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  works if the lhs does not give counts.
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  For variables in \code{formula} which are factors, \code{exclude}
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  must be specified explicitly; the default exclusions will not be used.
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}
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}
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\value{
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\value{
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  By default, when \code{sparse = FALSE},
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  By default, when \code{sparse = FALSE},
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  a contingency table in array representation of S3 class \code{c("xtabs",
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  a contingency table in array representation of S3 class \code{c("xtabs",
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    "table")}, with a \code{"call"} attribute storing the matched call.
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    "table")}, with a \code{"call"} attribute storing the matched call.