code: def test_equivalence(self):
      x = self.x.copy()
      assert_allclose(PCA(x).factors, pca(x)[0])
  
imports: from statsmodels.compat.platform import PLATFORM_WIN32
  import warnings
  import numpy
  import pandas
  import pytest
  from numpy.testing import assert_allclose, assert_equal, assert_raises
  from statsmodels.multivariate.pca import PCA, pca
  from statsmodels.multivariate.tests.results.datamlw import data, princomp1, princomp2
  from statsmodels.tools.sm_exceptions import EstimationWarning
label_desc: Use image node_id 14 for calling the TestPCA obj's underlying member method code with example usage: obj.test_equivalence() without return types