func (v evalLabel) PO(total int64) float64 {
	if v.Total == 0 {
		return 1
	}

	// return float64(e.Agreed) / float64(e.Total)
	return float64(total-v.Only1-v.Only2) / float64(total)
}
// PO: observed probability of agreement at a label
observed probability of agreement at a label
// PO : observed probability of agreement at a label
func (v evalLabel) PO(total int64) float64 {
	if v.Total == 0 {
		return 1
	}
	return float64(total-v.Only1-v.Only2) / float64(total)
}
func ( v evalLabel ) PO ( total int64 ) float64 { if v . Total == 0 { return 1 } return float64 ( total - v . Only1 - v . Only2 ) / float64 ( total ) }
observed probability of agreement at a label
observed probability of agreement at a label
// return float64(e.Agreed) / float64(e.Total)