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\item{n}{number of observations. If \code{length(n) > 1}, the length
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\item{n}{number of observations. If \code{length(n) > 1}, the length
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is taken to be the number required.}
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is taken to be the number required.}
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\item{size}{target for number of successful trials, or dispersion
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\item{size}{target for number of successful trials, or dispersion
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parameter (the shape parameter of the gamma mixing distribution).
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parameter (the shape parameter of the gamma mixing distribution).
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Must be strictly positive, need not be integer.}
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Must be strictly positive, need not be integer.}
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\item{prob}{probability of success in each trial. \code{0 < prob <= 1}.}
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\item{prob}{probability of success in each trial.
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\eqn{0 < \code{prob} \le 1}.}
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\item{mu}{alternative parametrization via mean: see \sQuote{Details}.}
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\item{mu}{alternative parametrization via mean: see \sQuote{Details}.}
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\item{log, log.p}{logical; if \code{TRUE}, probabilities
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\item{log, log.p}{logical; if \code{TRUE}, probabilities
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are given as logarithms.}
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are given as logarithms.}
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\item{lower.tail}{logical; if \code{TRUE} (default), probabilities are
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\item{lower.tail}{logical; if \code{TRUE} (default), probabilities are
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\eqn{P[X \le x]}, otherwise, \eqn{P[X > x]}.}
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\eqn{P[X \le x]}, otherwise, \eqn{P[X > x]}.}
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