code: def _ecdf(x):
      """no frills empirical cdf used in fdrcorrection"""
      nobs = len(x)
      return np.arange(1, nobs + 1) / float(nobs)
  
file_path: statsmodels/statsmodels/stats/multitest.py
imports: import numpy
  from statsmodels.stats._knockoff import RegressionFDR
label_desc: Use image node_id 1 for calling a global function with example usage: _ecdf(x) and returns: unknown