| rnegbin {MASS} | R Documentation |
Function to generate random outcomes from a Negative Binomial distribution,
with mean mu and variance mu + mu^2/theta.
rnegbin(n, mu = n, theta = stop("'theta' must be specified"))
n |
If a scalar, the number of sample values required. If a vector,
length(n) is the number required and n is used as the mean vector if
mu is not specified.
|
mu |
The vector of means. Short vectors are recycled. |
theta |
Vector of values of the theta parameter. Short vectors are recycled.
|
The function uses the representation of the Negative Binomial distribution
as a continuous mixture of Poisson distributions with Gamma distributed means.
Unlike rnbinom the index can be arbitrary.
Vector of random Negative Binomial variate values.
Changes .Random.seed in the usual way.
# Negative Binomials with means fitted(fm) and theta = 4.5 fm <- glm.nb(Days ~ ., data = quine) dummy <- rnegbin(fitted(fm), theta = 4.5)