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  Add a small amount of noise to a numeric vector.
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  Add a small amount of noise to a numeric vector.
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}
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}
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\value{
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\value{
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  \code{jitter(x, \dots)} returns a numeric of the same length as
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  \code{jitter(x, \dots)} returns a numeric of the same length as
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  \code{x}, but with an \code{amount} of noise added in order to break
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  \code{x}, but with an \code{amount} of noise added in order to break
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  ties.
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  ties.
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}
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}
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\details{
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\details{
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  The result, say \code{r}, is \code{r <- x + runif(n, -a, a)}
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  The result, say \code{r}, is \code{r <- x + runif(n, -a, a)}
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  where \code{n <- length(x)} and \code{a} is the \code{amount}
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  where \code{n <- length(x)} and \code{a} is the \code{amount}
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  argument (if specified).
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  argument (if specified).