docs: def resp_graph_raw(dataframe, image_name, dir='./'):
      """Response time graph for raw data
  
      :param pandas.DataFrame dataframe: the raw results dataframe
      :param str image_name: the output file name
      :param str dir: the output directory
      :return: None
      """
      factor = int(len(dataframe) / 10)
      df = dataframe.reset_index()
      fig = pygal.Dot(stroke=False,
                      x_label_rotation=25,
                      x_title='Elapsed Time In Test (secs)',
                      y_title='Average Response Time (secs)',
                      js=('scripts/pygal-tooltip.min.js',))
      try:
          grp = df.groupby(pd.cut(df.index, np.arange(0, len(df), factor)))
          fig.x_labels = [x for x in grp.first()['epoch']]
          fig.title = image_name.split('.')[0]
          fig.add('Time', [x for x in grp.describe()['scriptrun_time'].unstack()['mean'].round(2)])
      except ZeroDivisionError:
          print("Not enough data for raw graph")
      fig.render_to_file(filename=os.path.join(dir, image_name))