code: def test_corr(self):
      x1r = self.x1r
      d1w = self.d1w
  
      assert_almost_equal(np.corrcoef(x1r.T), d1w.corrcoef, 14)
  
imports: import numpy
  from scipy import stats
  import pandas
  from numpy.testing import assert_, assert_almost_equal, assert_allclose
  from statsmodels.stats.weightstats import DescrStatsW, CompareMeans, ttest_ind, ztest, zconfint
  from statsmodels.tools.testing import Holder
label_desc: Use image node_id 1 for calling the CheckWeightstats2dMixin obj's underlying member method code with example usage: obj.test_corr() without return types