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  1. ### Methods ###
  2. flip <- function(p){
  3.   sample(0:1, 1, prob = c(1 - p, p))
  4. }
  5.  
  6. flip_n <- function(prob, n){
  7.   res= NULL
  8.   for(i in 1:n){
  9.     res = rbind(res, flip(prob))
  10.   }
  11.   return(res)
  12. }
  13.  
  14. flip_til_sig <- function(prob, a = 0.05, n_min = 10, n_max = 100){
  15.   res = NULL
  16.   p   = 1
  17.   for(i in 1: n_min){
  18.     res = rbind(res, flip(prob))
  19.   }
  20.   while(p > a & length(res) <= n_max){
  21.     res = rbind(res, flip(prob))
  22.     p   = binom.test(sum(res), length(res), p = 0.5)$p.value
  23.   }
  24.   return(res)
  25. }
  26.  
  27. ### Simulation ###
  28. nsim = 1e3
  29. res1 = replicate(nsim, flip_n(prob = 0.5,  n = 100), simplify = F)
  30. res2 = replicate(nsim, flip_til_sig (prob = 0.5, a = 0.05, n_min = 10, n_max = 100), simplify = F)
  31.  
  32. par(mfrow = c(2, 1))
  33. hist(sapply(res1, mean), breaks = 20, col = "Grey", xlab = "% Success", main = "Collect N datapoints")
  34. hist(sapply(res2, mean), breaks = 20, col = "Grey", xlab = "% Success", main = "Collect until stopping rule")
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