The percentage of participants that have converted for this variant.

        Returns a > 0 float representing a percentage rate.

def conversion_rate(self):
        """
        The percentage of participants that have converted for this variant.

        Returns a > 0 float representing a percentage rate.
        """
        participants = self.participant_count
        if participants == 0:
            return 0.0
        return self.experiment.conversions_for(self.name) / float(participants)