rBetaBin function

Random generator from the beta-binomial distribution

The function generates random values from the beta-binomial distribution.

rBetaBin(n, size = NULL, mu = NULL, theta = NULL, phi = NULL)

Arguments

• n: the number of values to generate. If length(n) > 1, the length is taken to be the number required.
• size: the total number of trials.
• mu: the mean parameter. It must lie in (0, 1).
• theta: the overdispersion parameter. It must lie in (0, 1).
• phi: the precision parameter, an alternative way to specify the overdispersion parameter theta. It must be a real positive value.

Returns

A vector of length n.

Examples

rBetaBin(n = 100, size = 40, mu = .5, theta = .4)
rBetaBin(n = 100, size = 40, mu = .5, phi = 1.5)

References

Ascari, R., Migliorati, S. (2021). A new regression model for overdispersed binomial data accounting for outliers and an excess of zeros. Statistics in Medicine, 40 (17), 3895--3914. doi:10.1002/sim.9005