code: def code_without_intercept(self, levels):
      contrast = self._simple_contrast(levels)
      return ContrastMatrix(
          contrast, _name_levels("Simp.", levels[:-1])
      )
  
file_path: statsmodels/examples/python/contrasts.py
imports: import numpy
  import statsmodels.api
  import pandas
  from patsy.contrasts import Treatment
  from statsmodels.formula.api import ols
  from patsy.contrasts import ContrastMatrix
  from patsy.contrasts import Sum
  from patsy.contrasts import Diff
  from patsy.contrasts import Helmert
  from patsy.contrasts import Poly
label_desc: Use image node_id 3 for calling the Simple obj's underlying member method code with example usage: obj.code_without_intercept(levels) and returns: ContrastMatrix