binomial <- function(nmax = 100,
thr = 0.95,
alpha = 1,
beta = 1,
p_true = 0.5,
p_0 = 0.5){
for(j in seq.int(nmax, 0)){
if(pbeta(q = p_0, shape1 = alpha + j, shape2 = beta + nmax - j, lower.tail = FALSE) < thr){
targetatnmax <- j + 1
} else {
print(
break
}
}
result <- list(Success = Success, targeratnmax = targetatnmax)
return(result)
}
res = binomial(nmax,thr,alpha,beta,p_true,p_0)
res
In my program I am trying to find the number of successes needed to exceed 0.95 thr. I am trying to use a for loop with if else statements but when I run it I don't get the value I need. I know my value should be 59 but I cannot seem to get this. I know the code seems really messy but its only because I have been playing around with it for hours. PLEASE ANY HELP
Here is your code after clean-up:
binomial <- function(nmax = 100,
thr = 0.95,
alpha = 1,
beta = 1,
p_true = 0.5,
p_0 = 0.5){
targetatnmax <- 0
for(j in seq.int(0,nmax)){
if(pbeta(q = p_0, shape1 = alpha + j, shape2 = beta + nmax - j, lower.tail = FALSE) < thr){
targetatnmax <- j + 1
} else {
break
}
}
result <- list(targeratnmax = targetatnmax)
return(result)
}
res = binomial()
res
#$targeratnmax
#[1] 59
The main problem (other than the syntax errors and not existent objects) was that your loop ran from nmax
to 0 instead of the other way arround.
There is probably potential for optimization, but my understanding of the statistics is not good enough to really tackle that.
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