class_docstr: All confidence intervals are tested by conducting a hypothesis
  tests at the confidence interval values.
  
  See Also
  --------
  
  test_descriptive.py, test_ci_skew
class_docstr_tok: ["All","confidence","intervals","are","tested","by","conducting","a","hypothesis","tests","at","the","confidence","interval","values",".","See","Also","--","--","--","--","test_descriptive.py",",","test_ci_skew"]
code: def test_ci_beta3(self):
      beta3ci = self.res1.conf_int_el(3, method="nm")
      assert_almost_equal(beta3ci, self.res2.test_ci_beta3, 6)
  
imports: from numpy.testing import assert_almost_equal
  import pytest
  from statsmodels.datasets import stackloss
  from statsmodels.regression.linear_model import OLS
  from statsmodels.tools import add_constant
  from .results.el_results import RegressionResults
label_desc: Use image node_id 8 for calling the TestRegressionNM obj's underlying member method code with example usage: obj.test_ci_beta3() without return types