code: def test_ttest(self):
      self.res1.t_test(np.eye(len(self.res1.params)))
  
imports: import numpy
  from scipy import stats
  from statsmodels.base.model import GenericLikelihoodModel
  from numpy.testing import assert_array_less, assert_almost_equal, assert_allclose
label_desc: Use image node_id 3 for calling the CheckGenericMixin obj's underlying member method code with example usage: obj.test_ttest() without return types