code: def setup_class(cls):
      cls.corr_equal = np.asarray(
          [[1.0, 0.5, 0.5], [0.5, 1, 0.5], [0.5, 0.5, 1]]
      )
      cls.a = -1 * np.ones(3)
      cls.b = 3 * np.ones(3)
      cls.df = 4
  
      corr2 = cls.corr_equal.copy()
      corr2[2, 1] = -0.5
      cls.corr2 = corr2
  
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 1 for calling the Test_MVN_MVT_prob obj's underlying member method code with example usage: obj.setup_class(cls) without return types