docs: def _get_data(self, kwargs):
          """Convenience wrapper to get statistics data"""
          if "ds" not in kwargs:
              raise ValueError("Keyword argument 'ds' missing.")
  
          ds = kwargs["ds"]
  
          if self.req_feature:
              if "feature" not in kwargs:
                  raise ValueError("Keyword argument 'feature' missing.")
              return self.get_feature(ds, kwargs["feature"])
          else:
              return ds