code: def test_mvn_mvt_4(self):
      a, bl = self.a, self.b
      df = self.df
      corr2 = self.corr2
  
      # from 0 to inf
      # print '0 inf'
      a2 = a.copy()
      a2[:] = -np.inf
      probmvn_R = 0.1666667  # error approx. 6.1e-08
      probmvt_R = 0.1666667  # error approx. 8.2e-08
      assert_almost_equal(
          probmvt_R, mvstdtprob(np.zeros(3), -a2, corr2, df), 4
      )
      assert_almost_equal(
          probmvn_R,
          mvstdnormcdf(
              np.zeros(3), -a2, corr2, maxpts=100000, abseps=1e-5
          ),
          4,
      )
  
file_path: statsmodels/statsmodels/sandbox/distributions/tests/test_multivariate.py
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_allclose
  from statsmodels.sandbox.distributions.multivariate import mvstdtprob, mvstdnormcdf
  from statsmodels.sandbox.distributions.mv_normal import MVT, MVNormal
label_desc: Use image node_id 5 for calling the Test_MVN_MVT_prob obj's underlying member method code with example usage: obj.test_mvn_mvt_4() without return types