docs: def get_ts_stats_significance(self, x, ts, stat_ts_func, null_ts_func, B=1000, permute_fast=False, label_ts=''):
          """ Returns the statistics, pvalues and the actual number of bootstrap
              samples. """
          stats_ts, pvals, nums = ts_stats_significance(
              ts, stat_ts_func, null_ts_func, B=B, permute_fast=permute_fast)
          return stats_ts, pvals, nums