Function pgfpoissonlindley

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Description

This function calculates value of the pgf of the Poisson-Lindley distribution.

Usage

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pgfpoissonlindley(s, params)

Arguments

s

Value of the parameter of the pgf. It should be from interval [-1,1]. In the opposite pgf diverges.

params

Positive parameter of the Poisson-Lindley distribution, such that params<-theta.

Author(s)

S. Nadarajah, B. V. Popovic, M. M. Ristic

References

Johnson N, Kotz S, Kemp A (1992) Univariate Discrete Distributions, John Wiley and Sons, New York

http://www.am.qub.ac.uk/users/g.gribakin/sor/Chap3.pdf

Examples

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params<-4
pgfpoissonlindley(.5,params)


## The function is currently defined as

pgfpoissonlindley <- function(s,params) {
k<-s[abs(s)>1]
if (length(k)>0)
    warning("At least one element of the vector s are out of interval [-1,1]")
if (length(params)>1) 
    stop("The length of params is 1")
theta<-params[1]
if (theta<=0)
    stop ("Parameter lambda must be positive")
theta^2*(theta+2-s)/((theta+1)*(theta+1-s)^2)
}

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