code: def as_frame(self):
          
          data = {sid: pd.Series(data) for sid, data in self.response_map.iteritems()}
          frame = pd.DataFrame.from_dict(data, orient='index')
          # layer in any missing fields just in case
          frame = frame.reindex_axis(self.request.fields, axis=1)
          return frame
docs: :return: Multi-Index DataFrame