code: def test_estimable(self):
      X2 = np.column_stack((self.X, self.X[:, 5]))
      c = Contrast(self.X[:, 5], X2)
  
file_path: statsmodels/statsmodels/stats/tests/test_contrast.py
imports: import numpy
  import numpy.random
  from numpy.testing import assert_almost_equal, assert_equal
  from statsmodels.stats.contrast import Contrast
  import statsmodels.stats.contrast
label_desc: Use image node_id 5 for calling the TestContrast obj's underlying member method code with example usage: obj.test_estimable() without return types