def class_wise_error_rate(self, event_label):
        """Class-wise error rate metrics (error_rate, deletion_rate, and insertion_rate)

        Returns
        -------
        dict
            results in a dictionary format

        """

        deletion_rate = metric.deletion_rate(
            Nref=self.class_wise[event_label]['Nref'],
            Ndeletions=self.class_wise[event_label]['Nfn']
        )

        insertion_rate = metric.insertion_rate(
            Nref=self.class_wise[event_label]['Nref'],
            Ninsertions=self.class_wise[event_label]['Nfp']
        )

        error_rate = metric.error_rate(
            deletion_rate_value=deletion_rate,
            insertion_rate_value=insertion_rate
        )

        return {
            'error_rate': error_rate,
            'deletion_rate': deletion_rate,
            'insertion_rate': insertion_rate
        }