12 lines
277 B
Ruby
12 lines
277 B
Ruby
class DanbooruMath
|
|
def self.ci_lower_bound(pos, n, confidence = 0.95)
|
|
if n == 0
|
|
return 0
|
|
end
|
|
|
|
z = Statistics2.pnormaldist(1-(1-confidence)/2)
|
|
phat = 1.0*pos/n
|
|
100 * (phat + z*z/(2*n) - z * Math.sqrt((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n)
|
|
end
|
|
end
|