code: def rejectionline(n, alpha=0.5):
      """reference line for rejection in multiple tests
  
      Not used anymore
  
      from: section 3.2, page 60
      """
      t = np.arange(n) / float(n)
      frej = t / (t * (1 - alpha) + alpha)
      return frej
  
imports: from collections import namedtuple
  from statsmodels.compat.python import lzip, lrange
  import copy
  import math
  import numpy
  from numpy.testing import assert_almost_equal, assert_equal
  from scipy import stats, interpolate
  from statsmodels.iolib.table import SimpleTable
  from statsmodels.stats.multitest import multipletests, _ecdf, fdrcorrection, fdrcorrection_twostage
  from statsmodels.graphics import utils
  from statsmodels.tools.sm_exceptions import ValueWarning
label_desc: Use image node_id 9 for calling a global function with example usage: rejectionline(n, alpha) and returns: frej