VGAM (version 1.1-13)

Skellam: The Skellam Distribution

Description

Density and random generation for the Skellam distribution.

Usage

dskellam(x, mu1, mu2, log = FALSE)
rskellam(n, mu1, mu2)

Value

dskellam gives the density, and

rskellam generates random deviates.

Arguments

x

vector of quantiles.

n

number of observations. Same as runif.

mu1, mu2

See skellam

.

log

Logical; if TRUE, the logarithm is returned.

Warning

Numerical problems may occur for data if ${\mu }_1$ and/or ${\mu }_2$ are large. The normal approximation for this case has not been implemented yet.

Details

See skellam, the VGAM family function for estimating the parameters, for the formula of the probability density function and other details.

See Also

skellam, dpois.

Examples

if (FALSE)  mu1 <- 1; mu2 <- 2; x <- (-7):7
plot(x, dskellam(x, mu1, mu2), type = "h", las = 1, col = "blue",
     main = paste("Density of Skellam distribution with mu1 = ", mu1,
                  " and mu2 = ", mu2, sep = ""))