| Double Poisson(rmutil) | R Documentation |
ddoublepois(y, m, s) pdoublepois(q, m, s)
y |
vector of counts |
q |
vector of quantiles |
m |
vector of means |
s |
vector of overdispersion parameters |
These functions provide information about the double Poisson
distribution with parameters m and s. ddoublepois
gives the density and pdoublepois gives the distribution function.
The double Poisson distribution with mu = m has density
p(y) = c(m,s) s^(y/m) (m/y)^(y log(s)) y^(y-1) / y!
for y = 0, ..., where c(.) is a normalizing constant.
dpois for the Poisson, dmultpois for
the multiplicative Poisson, and dnbinom
for the negative binomial distribution.
ddoublepois(5,5,0.9) pdoublepois(5,5,0.9)