code: def test_pdf(self):
      #'\nsquare of standard normal random variable is chisquare with dof=1 distributed'
      pdftr = self.dist.pdf(xx, *self.trargs, **self.trkwds)
      pdfst = self.statsdist.pdf(xx, *self.stargs, **self.stkwds)
      assert_almost_equal(pdfst, pdftr, 13)
  
imports: import numpy
  from numpy.testing import assert_almost_equal
  from scipy import stats
  from statsmodels.sandbox.distributions.extras import ExpTransf_gen, LogTransf_gen, squarenormalg, absnormalg, negsquarenormalg, squaretg
label_desc: Use image node_id 2 for calling the CheckDistEquivalence obj's underlying member method code with example usage: obj.test_pdf() without return types