pgfIbinomialbinomial {Compounding} R Documentation

## Function pgfIbinomialbinomial

### Description

This function calculates value of the pgf's inverse of the binomial-binomial distribution.

### Usage

```pgfIbinomialbinomial(s, params)
```

### Arguments

 `s` Value of the parameter of the pgf. It should be from interval [-1,1]. In the opposite pgf diverges. `params` List of the parameters of the Poisson-binomial distribution, such that params<-c(p1,p2,m,n), where theta is positive number, p1, p2 are probabilities, and m,n are positive integers.

### 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

```params<-c(.4,.9,5,7)
pgfIbinomialbinomial(.5,params)

## The function is currently defined as

pgfIbinomialbinomial <- 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)<4)
stop("At least one value in params is missing")
if (length(params)>4)
stop("The length of params is 4")
p1<-params[1]
p2<-params[2]
m<-params[3]
n<-params[4]
if ((p1>=1)|(p1<=0))
stop ("Parameter p1 belongs to the interval (0,1)")
if ((p2>=1)|(p2<=0))
stop ("Parameter p2 belongs to the interval (0,1)")
if (m<0)
stop("Parameter m must be positive integer")
if (n<0)
stop("Parameter n must be positive")
if(!(abs(n-round(n))<.Machine\$double.eps^0.5))
stop("Parameter n must be positive integer")
zval<-(s^(1/m)-1+p1)/p1
(zval^(1/n)-1+p2)/p2
}
```

[Package Compounding version 1.0.2 Index]