Confidence Comment Algorithm by Go (golang)

main.go

package main

import (
	"fmt"
	"math"
)

func _confidence(ups int32, downs int32) float64 {
	d := ups + downs
	var n float64 = float64(d)

	z := 1.0 //1.0 = 85%, 1.6 = 95%
	phat := float64(ups) / n
	return math.Sqrt(phat+z*z/(2*n)-z*((phat*(1-phat)+z*z/(4*n))/n)) / (1 + z*z/n)
}

func confidence(ups int32, downs int32) float64 {
	d := ups + downs
	var n float64 = float64(d)
	if n == 0 {
		return 0
	} else {
		return _confidence(ups, downs)
	}
}