params<-c(.4,.9,5,7)
pgfDbinomialbinomial(.5,params)
## The function is currently defined as
pgfDbinomialbinomial <- 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")
m*n*p1*p2*(1-p2+p2*s)^(n-1)*(1-p1+p1*(1-p2+p2*s)^n)^(m-1)
}
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