Variance of the negative binomial distribution

The type 1 zero-inflated negative binomial distribution is a standard negative binomial distribution with an additional point mass at zero.

The type 1 zero-inflated poisson is a standard Poisson distribution with an additional point mass at zero.

Usage

var_nbinom(mu, size)

var_zinbinom1(mu, size, zero)

var_zipois1(mu, zero)

Arguments

mu

mean of the distribution. Must be on the original scale.

size

Size of the negative binomial distribution. Must be strict positive.

zero

Probability of the point mass at zero.