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# Bayesian sample size for single arm single stage binomial trial
bayes_binom_one_postprob_onestage=function(p0,p1,eta,zeta,prior.a=0,prior.b=0,round=TRUE){
n=3
success=1
failure=max(success-1,0)
a=0;b=0
while(a<eta | b<zeta){
n=n+1
success = n
a=pbeta(p1,prior.a+success,prior.b+n-success)
while(a<eta & success > 1){
success=success-1
failure=success-1
a=pbeta(p1,prior.a+failure,prior.b+n-failure)
}
a=pbeta(p1,prior.a+failure,prior.b+n-failure)
b=1-pbeta(p0,prior.a+success,prior.b+n-success)
print(c(n, success, failure, a, b))
}
alpha=1-pbinom(success-1,n,p0)
power=1-pbinom(success-1,n,p1)
if(round==TRUE){
eta=round(a,3)
zeta=round(b,3)
alpha=round(1-pbinom(success-1,n,p0),3)
power=round(1-pbinom(success-1,n,p1),3)
}
return(trialDesign_binom_one(reviews=n,success=success,eta=eta,zeta=zeta,alpha=alpha,power=power,exp.p0=n,exp.p1=n,p0=p0,p1=p1))
}
# ended
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