code: def test_results(self):
      unexp, exp, gap = self.one_model.params
      unexp_std, exp_std = self.one_model.std
      one_params_stata_results = np.array(
          [75.45370, 83.29673, 158.75044]
      )
      one_std_stata_results = np.array([64.58479, 71.05619])
  
      np.testing.assert_almost_equal(
          unexp, one_params_stata_results[0], 3
      )
      np.testing.assert_almost_equal(
          exp, one_params_stata_results[1], 3
      )
      np.testing.assert_almost_equal(
          gap, one_params_stata_results[2], 3
      )
  
      np.testing.assert_almost_equal(
          unexp_std, one_std_stata_results[0], 3
      )
      np.testing.assert_almost_equal(
          exp_std, one_std_stata_results[1], 3
      )
  
imports: import numpy
  from statsmodels.datasets.ccard.data import load_pandas
  from statsmodels.stats.oaxaca import OaxacaBlinder
  from statsmodels.tools.tools import add_constant
label_desc: Use image node_id 2 for calling the TestOneModel obj's underlying member method code with example usage: obj.test_results() without return types