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  If a value is specified for \code{collapse}, the values in the result
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  If a value is specified for \code{collapse}, the values in the result
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  are then concatenated into a single string, with the elements being
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  are then concatenated into a single string, with the elements being
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  separated by the value of \code{collapse}.
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  separated by the value of \code{collapse}.
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}
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}
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\value{
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\value{
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  A character vector of the concatenated values.  Thus will be of length
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  A character vector of the concatenated values.  This will be of length
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  zero if all the objects are, unless \code{collapse} is non-NULL, in
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  zero if all the objects are, unless \code{collapse} is non-NULL, in
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  which case it is a single empty string.
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  which case it is a single empty string.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)